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Raised beach

A raised beach, coastal terrace,[1] or perched coastline is a relatively flat, horizontal or gently inclined surface of marine origin,[2] mostly an old abrasion platform which has been lifted out of the sphere of wave activity (sometimes called "tread"). Thus, it lies above or under the current sea level, depending on the time of its formation.[3][4] It is bounded by a steeper ascending slope on the landward side and a steeper descending slope on the seaward side[2] (sometimes called "riser"). Due to its generally flat shape, it is often used for anthropogenic structures such as settlements and infrastructure.[3]

Raised beach and marine terraces at Water Canyon beach
A raised beach, now at 4 metres (13 ft) above high tide, formed King's Cave, Arran, below an earlier raised beach at around 30 metres (98 ft) height.

A raised beach is an emergent coastal landform. Raised beaches and marine terraces are beaches or wave-cut platforms raised above the shoreline by a relative fall in the sea level.[5]

Relict sea-cliffs at King's Cave on Arran's south-west coast

Around the world, a combination of tectonic coastal uplift and Quaternary sea-level fluctuations has resulted in the formation of marine terrace sequences, most of which were formed during separate interglacial highstands that can be correlated to marine isotope stages (MIS).[6]

A marine terrace commonly retains a shoreline angle or inner edge, the slope inflection between the marine abrasion platform and the associated paleo sea-cliff. The shoreline angle represents the maximum shoreline of a transgression and therefore a paleo-sea level.

Morphology edit

 
Typical sequence of erosional marine terraces. 1) low tide cliff/ramp with deposition, 2) modern shore (wave-cut/abrasion-) platform, 3) notch/inner edge, modern shoreline angle, 4) modern sea cliff, 5) old shore (wave-cut/abrasion-) platform, 6) paleo-shoreline angle, 7) paleo-sea cliff, 8) terrace cover deposits/marine deposits, colluvium, 9) alluvial fan, 10) decayed and covered sea cliff and shore platform, 11) paleo-sea level I, 12) paleo-sea level II. – after various authors[1][3][7][8]

The platform of a marine terrace usually has a gradient between 1°–5° depending on the former tidal range with, commonly, a linear to concave profile. The width is quite variable, reaching up to 1,000 metres (3,300 ft), and seems to differ between the northern and southern hemispheres.[9] The cliff faces that delimit the platform can vary in steepness depending on the relative roles of marine and subaerial processes.[10] At the intersection of the former shore (wave-cut/abrasion-) platform and the rising cliff face the platform commonly retains a shoreline angle or inner edge (notch) that indicates the location of the shoreline at the time of maximum sea ingression and therefore a paleo-sea level.[11] Sub-horizontal platforms usually terminate in a low tide cliff, and it is believed that the occurrence of these platforms depends on tidal activity.[10] Marine terraces can extend for several tens of kilometers parallel to the coast.[3]

Older terraces are covered by marine and/or alluvial or colluvial materials while the uppermost terrace levels usually are less well preserved.[12] While marine terraces in areas of relatively rapid uplift rates (> 1 mm/year) can often be correlated to individual interglacial periods or stages, those in areas of slower uplift rates may have a polycyclic origin with stages of returning sea levels following periods of exposure to weathering.[2]

Marine terraces can be covered by a wide variety of soils with complex histories and different ages. In protected areas, allochthonous sandy parent materials from tsunami deposits may be found. Common soil types found on marine terraces include planosols and solonetz.[13]

Formation edit

It is now widely thought that marine terraces are formed during the separated highstands of interglacial stages correlated to marine isotope stages (MIS).[14][15][16][17][18]

Causes edit

 
Comparison of two sea level reconstructions during the last 500 Ma. The scale of change during the last glacial/interglacial transition is indicated with a black bar.

The formation of marine terraces is controlled by changes in environmental conditions and by tectonic activity during recent geological times. Changes in climatic conditions have led to eustatic sea-level oscillations and isostatic movements of the Earth's crust, especially with the changes between glacial and interglacial periods.

Processes of eustasy lead to glacioeustatic sea level fluctuations due to changes of the water volume in the oceans, and hence to regressions and transgressions of the shoreline. At times of maximum glacial extent during the last glacial period, the sea level was about 100 metres (330 ft) lower compared to today. Eustatic sea level changes can also be caused by changes in the void volume of the oceans, either through sedimento-eustasy or tectono-eustasy.[19]

Processes of isostasy involve the uplift of continental crusts along with their shorelines. Today, the process of glacial isostatic adjustment mainly applies to Pleistocene glaciated areas.[19] In Scandinavia, for instance, the present rate of uplift reaches up to 10 millimetres (0.39 in)/year.[20]

In general, eustatic marine terraces were formed during separate sea level highstands of interglacial stages[19][21] and can be correlated to marine oxygen isotopic stages (MIS).[22][23] Glacioisostatic marine terraces were mainly created during stillstands of the isostatic uplift.[19] When eustasy was the main factor for the formation of marine terraces, derived sea level fluctuations can indicate former climate changes. This conclusion has to be treated with care, as isostatic adjustments and tectonic activities can be extensively overcompensated by a eustatic sea level rise. Thus, in areas of both eustatic and isostatic or tectonic influences, the course of the relative sea level curve can be complicated.[24] Hence, most of today's marine terrace sequences were formed by a combination of tectonic coastal uplift and Quaternary sea level fluctuations.

Jerky tectonic uplifts can also lead to marked terrace steps while smooth relative sea level changes may not result in obvious terraces, and their formations are often not referred to as marine terraces.[11]

Processes edit

Marine terraces often result from marine erosion along rocky coastlines[2] in temperate regions due to wave attack and sediment carried in the waves. Erosion also takes place in connection with weathering and cavitation. The speed of erosion is highly dependent on the shoreline material (hardness of rock[10]), the bathymetry, and the bedrock properties and can be between only a few millimeters per year for granitic rocks and more than 10 metres (33 ft) per year for volcanic ejecta.[10][25] The retreat of the sea cliff generates a shore (wave-cut/abrasion-) platform through the process of abrasion. A relative change of the sea level leads to regressions or transgressions and eventually forms another terrace (marine-cut terrace) at a different altitude, while notches in the cliff face indicate short stillstands.[25]

It is believed that the terrace gradient increases with tidal range and decreases with rock resistance. In addition, the relationship between terrace width and the strength of the rock is inverse, and higher rates of uplift and subsidence as well as a higher slope of the hinterland increases the number of terraces formed during a certain time.[26]

Furthermore, shore platforms are formed by denudation and marine-built terraces arise from accumulations of materials removed by shore erosion.[2] Thus, a marine terrace can be formed by both erosion and accumulation. However, there is an ongoing debate about the roles of wave erosion and weathering in the formation of shore platforms.[10]

Reef flats or uplifted coral reefs are another kind of marine terrace found in intertropical regions. They are a result of biological activity, shoreline advance and accumulation of reef materials.[2]

While a terrace sequence can date back hundreds of thousands of years, its degradation is a rather fast process. A deeper transgression of cliffs into the shoreline may completely destroy previous terraces; but older terraces might be decayed[25] or covered by deposits, colluvia or alluvial fans.[3] Erosion and backwearing of slopes caused by incisive streams play another important role in this degradation process.[25]

Land and sea level history edit

The total displacement of the shoreline relative to the age of the associated interglacial stage allows calculation of a mean uplift rate or the calculation of eustatic level at a particular time if the uplift is known.

In order to estimate vertical uplift, the eustatic position of the considered paleo sea levels relative to the present one must be known as precisely as possible. Current chronology relies principally on relative dating based on geomorphologic criteria, but in all cases the shoreline angle of the marine terraces is associated with numerical ages. The best-represented terrace worldwide is the one correlated to the last interglacial maximum (MIS 5e).[27][28][29] Age of MISS 5e is arbitrarily fixed to range from 130 to 116 ka[30] but is demonstrated to range from 134 to 113 ka in Hawaii and Barbados with a peak from 128 to 116 ka on tectonically stable coastlines. Older marine terraces well represented in worldwide sequences are those related to MIS 9 (~303–339 ka) and 11 (~362–423 ka).[31] Compilations show that sea level was 3 ± 3 meters higher during MIS 5e, MIS 9 and 11 than during the present one and −1 ± 1 m to the present one during MIS 7.[32][33] Consequently, MIS 7 (~180-240 ka) marine terraces are less pronounced and sometimes absent. When the elevations of these terraces are higher than the uncertainties in paleo-eustatic sea level mentioned for the Holocene and Late Pleistocene, these uncertainties have no effect on overall interpretation.

Sequence can also occur where the accumulation of ice sheets have depressed the land so that when the ice sheets melts the land readjusts with time thus raising the height of the beaches (glacio-isostatic rebound) and in places where co-seismic uplift occur. In the latter case, the terrace are not correlated with sea level highstand even if co-seismic terrace are known only for the Holocene.

Mapping and surveying edit

 
Aerial photograph of the lowest marine terrace at Tongue Point, New Zealand

For exact interpretations of the morphology, extensive datings, surveying and mapping of marine terraces is applied. This includes stereoscopic aerial photographic interpretation (ca. 1 : 10,000 – 25,000[11]), on-site inspections with topographic maps (ca. 1 : 10,000) and analysis of eroded and accumulated material. Moreover, the exact altitude can be determined with an aneroid barometer or preferably with a levelling instrument mounted on a tripod. It should be measured with the accuracy of 1 cm (0.39 in) and at about every 50–100 metres (160–330 ft), depending on the topography. In remote areas, the techniques of photogrammetry and tacheometry can be applied.[24]

Correlation and dating edit

Different methods for dating and correlation of marine terraces can be used and combined.

Correlational dating edit

The morphostratigraphic approach focuses especially in regions of marine regression on the altitude as the most important criterion to distinguish coastlines of different ages. Moreover, individual marine terraces can be correlated based on their size and continuity. Also, paleo-soils as well as glacial, fluvial, eolian and periglacial landforms and sediments may be used to find correlations between terraces.[24] On New Zealand's North Island, for instance, tephra and loess were used to date and correlate marine terraces.[34] At the terminus advance of former glaciers marine terraces can be correlated by their size, as their width decreases with age due to the slowly thawing glaciers along the coastline.[24]

The lithostratigraphic approach uses typical sequences of sediment and rock strata to prove sea level fluctuations on the basis of an alternation of terrestrial and marine sediments or littoral and shallow marine sediments. Those strata show typical layers of transgressive and regressive patterns.[24] However, an unconformity in the sediment sequence might make this analysis difficult.[35]

The biostratigraphic approach uses remains of organisms which can indicate the age of a marine terrace. For that, often mollusc shells, foraminifera or pollen are used. Especially Mollusca can show specific properties depending on their depth of sedimentation. Thus, they can be used to estimate former water depths.[24]

Marine terraces are often correlated to marine oxygen isotopic stages (MIS)[22] and can also be roughly dated using their stratigraphic position.[24]

Direct dating edit

There are various methods for the direct dating of marine terraces and their related materials. The most common method is 14C radiocarbon dating,[36] which has been used, for example, on the North Island of New Zealand to date several marine terraces.[37] It utilizes terrestrial biogenic materials in coastal sediments, such as mollusc shells, by analyzing the 14C isotope.[24] In some cases, however, dating based on the 230Th/234U ratio was applied, in case detrital contamination or low uranium concentrations made finding a high resolution dating difficult.[38] In a study in southern Italy paleomagnetism was used to carry out paleomagnetic datings[39] and luminescence dating (OSL) was used in different studies on the San Andreas Fault[40] and on the Quaternary Eupcheon Fault in South Korea.[41] In the last decade, the dating of marine terraces has been enhanced since the arrival of terrestrial cosmogenic nuclides method, and particularly through the use of 10Be and 26Al cosmogenic isotopes produced on site.[42][43][44] These isotopes record the duration of surface exposure to cosmic rays.[45] This exposure age reflects the age of abandonment of a marine terrace by the sea.

In order to calculate the eustatic sea level for each dated terrace, it is assumed that the eustatic sea-level position corresponding to at least one marine terrace is known and that the uplift rate has remained essentially constant in each section.[2]

Relevance for other research areas edit

 
Marine terraces south of Choapa River in Chile. These terraces have been studied among others by Roland Paskoff.

Marine terraces play an important role in the research on tectonics and earthquakes. They may show patterns and rates of tectonic uplift[40][44][46] and thus may be used to estimate the tectonic activity in a certain region.[41] In some cases the exposed secondary landforms can be correlated with known seismic events such as the 1855 Wairarapa earthquake on the Wairarapa Fault near Wellington, New Zealand which produced a 2.7-metre (8 ft 10 in) uplift.[47] This figure can be estimated from the vertical offset between raised shorelines in the area.[48]

Furthermore, with the knowledge of eustatic sea level fluctuations, the speed of isostatic uplift can be estimated[49] and eventually the change of relative sea levels for certain regions can be reconstructed. Thus, marine terraces also provide information for the research on climate change and trends in future sea level changes.[10][50]

When analyzing the morphology of marine terraces, it must be considered, that both eustasy and isostasy can have an influence on the formation process. This way can be assessed, whether there were changes in sea level or whether tectonic activities took place.

Prominent examples edit

 
Quaternary marine terraces at Tongue Point, New Zealand

Raised beaches are found in a wide variety of coast and geodynamical background such as subduction on the Pacific coasts of South and North America, passive margin of the Atlantic coast of South America,[51] collision context on the Pacific coast of Kamchatka, Papua New Guinea, New Zealand, Japan, passive margin of the South China Sea coast, on west-facing Atlantic coasts, such as Donegal Bay, County Cork and County Kerry in Ireland; Bude, Widemouth Bay, Crackington Haven, Tintagel, Perranporth and St Ives in Cornwall, the Vale of Glamorgan, Gower Peninsula, Pembrokeshire and Cardigan Bay in Wales, Jura and the Isle of Arran in Scotland, Finistère in Brittany and Galicia in Northern Spain and at Squally Point in Eatonville, Nova Scotia within the Cape Chignecto Provincial Park.

Other important sites include various coasts of New Zealand, e.g. Turakirae Head near Wellington being one of the world's best and most thoroughly studied examples.[47][48][52] Also along the Cook Strait in New Zealand, there is a well-defined sequence of uplifted marine terraces from the late Quaternary at Tongue Point. It features a well preserved lower terrace from the last interglacial, a widely eroded higher terrace from the penultimate interglacial and another still higher terrace, which is nearly completely decayed.[47] Furthermore, on New Zealand's North Island at the eastern Bay of Plenty, a sequence of seven marine terraces has been studied.[12][37]

 
Air photograph of the marine terraced coastline north of Santa Cruz, California, note Highway 1 running along the coast along the lower terraces

Along many coasts of mainland and islands around the Pacific, marine terraces are typical coastal features. An especially prominent marine terraced coastline can be found north of Santa Cruz, near Davenport, California, where terraces probably have been raised by repeated slip earthquakes on the San Andreas Fault.[40][53] Hans Jenny famously researched the pygmy forests of the Mendocino and Sonoma county marine terraces. The marine terrace's "ecological staircase" of Salt Point State Park is also bound by the San Andreas Fault.

Along the coasts of South America marine terraces are present,[44][54] where the highest ones are situated where plate margins lie above subducted oceanic ridges and the highest and most rapid rates of uplift occur.[7][46] At Cape Laundi, Sumba Island, Indonesia an ancient patch reef can be found at 475 m (1,558 ft) above sea level as part of a sequence of coral reef terraces with eleven terraces being wider than 100 m (330 ft).[55] The coral marine terraces at Huon Peninsula, New Guinea, which extend over 80 km (50 mi) and rise over 600 m (2,000 ft) above present sea level[56] are currently on UNESCO's tentative list for world heritage sites under the name Houn Terraces - Stairway to the Past.[57]

Other considerable examples include marine terraces rising up to 360 m (1,180 ft) on some Philippine Islands[58] and along the Mediterranean Coast of North Africa, especially in Tunisia, rising up to 400 m (1,300 ft).[59]

Related coastal geography edit

Uplift can also be registered through tidal notch sequences. Notches are often portrayed as lying at sea level; however notch types actually form a continuum from wave notches formed in quiet conditions at sea level to surf notches formed in more turbulent conditions and as much as 2 m (6.6 ft) above sea level.[60] As stated above, there was at least one higher sea level during the Holocene, so that some notches may not contain a tectonic component in their formation.

See also edit

References edit

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External links edit

  • at NAHSTE
  • US Geological Survey Marine Terrace Fact Sheet - Wikimedia link, USGS link

raised, beach, marine, terrace, redirects, here, street, fremantle, marine, terrace, fremantle, raised, beach, coastal, terrace, perched, coastline, relatively, flat, horizontal, gently, inclined, surface, marine, origin, mostly, abrasion, platform, which, bee. Marine terrace redirects here For the street in Fremantle see Marine Terrace Fremantle A raised beach coastal terrace 1 or perched coastline is a relatively flat horizontal or gently inclined surface of marine origin 2 mostly an old abrasion platform which has been lifted out of the sphere of wave activity sometimes called tread Thus it lies above or under the current sea level depending on the time of its formation 3 4 It is bounded by a steeper ascending slope on the landward side and a steeper descending slope on the seaward side 2 sometimes called riser Due to its generally flat shape it is often used for anthropogenic structures such as settlements and infrastructure 3 Raised beach and marine terraces at Water Canyon beach A raised beach now at 4 metres 13 ft above high tide formed King s Cave Arran below an earlier raised beach at around 30 metres 98 ft height A raised beach is an emergent coastal landform Raised beaches and marine terraces are beaches or wave cut platforms raised above the shoreline by a relative fall in the sea level 5 Relict sea cliffs at King s Cave on Arran s south west coast Around the world a combination of tectonic coastal uplift and Quaternary sea level fluctuations has resulted in the formation of marine terrace sequences most of which were formed during separate interglacial highstands that can be correlated to marine isotope stages MIS 6 A marine terrace commonly retains a shoreline angle or inner edge the slope inflection between the marine abrasion platform and the associated paleo sea cliff The shoreline angle represents the maximum shoreline of a transgression and therefore a paleo sea level Contents 1 Morphology 2 Formation 2 1 Causes 2 2 Processes 2 3 Land and sea level history 3 Mapping and surveying 4 Correlation and dating 4 1 Correlational dating 4 2 Direct dating 5 Relevance for other research areas 6 Prominent examples 7 Related coastal geography 8 See also 9 References 10 External linksMorphology edit nbsp Typical sequence of erosional marine terraces 1 low tide cliff ramp with deposition 2 modern shore wave cut abrasion platform 3 notch inner edge modern shoreline angle 4 modern sea cliff 5 old shore wave cut abrasion platform 6 paleo shoreline angle 7 paleo sea cliff 8 terrace cover deposits marine deposits colluvium 9 alluvial fan 10 decayed and covered sea cliff and shore platform 11 paleo sea level I 12 paleo sea level II after various authors 1 3 7 8 The platform of a marine terrace usually has a gradient between 1 5 depending on the former tidal range with commonly a linear to concave profile The width is quite variable reaching up to 1 000 metres 3 300 ft and seems to differ between the northern and southern hemispheres 9 The cliff faces that delimit the platform can vary in steepness depending on the relative roles of marine and subaerial processes 10 At the intersection of the former shore wave cut abrasion platform and the rising cliff face the platform commonly retains a shoreline angle or inner edge notch that indicates the location of the shoreline at the time of maximum sea ingression and therefore a paleo sea level 11 Sub horizontal platforms usually terminate in a low tide cliff and it is believed that the occurrence of these platforms depends on tidal activity 10 Marine terraces can extend for several tens of kilometers parallel to the coast 3 Older terraces are covered by marine and or alluvial or colluvial materials while the uppermost terrace levels usually are less well preserved 12 While marine terraces in areas of relatively rapid uplift rates gt 1 mm year can often be correlated to individual interglacial periods or stages those in areas of slower uplift rates may have a polycyclic origin with stages of returning sea levels following periods of exposure to weathering 2 Marine terraces can be covered by a wide variety of soils with complex histories and different ages In protected areas allochthonous sandy parent materials from tsunami deposits may be found Common soil types found on marine terraces include planosols and solonetz 13 Formation editIt is now widely thought that marine terraces are formed during the separated highstands of interglacial stages correlated to marine isotope stages MIS 14 15 16 17 18 Causes edit nbsp Comparison of two sea level reconstructions during the last 500 Ma The scale of change during the last glacial interglacial transition is indicated with a black bar The formation of marine terraces is controlled by changes in environmental conditions and by tectonic activity during recent geological times Changes in climatic conditions have led to eustatic sea level oscillations and isostatic movements of the Earth s crust especially with the changes between glacial and interglacial periods Processes of eustasy lead to glacioeustatic sea level fluctuations due to changes of the water volume in the oceans and hence to regressions and transgressions of the shoreline At times of maximum glacial extent during the last glacial period the sea level was about 100 metres 330 ft lower compared to today Eustatic sea level changes can also be caused by changes in the void volume of the oceans either through sedimento eustasy or tectono eustasy 19 Processes of isostasy involve the uplift of continental crusts along with their shorelines Today the process of glacial isostatic adjustment mainly applies to Pleistocene glaciated areas 19 In Scandinavia for instance the present rate of uplift reaches up to 10 millimetres 0 39 in year 20 In general eustatic marine terraces were formed during separate sea level highstands of interglacial stages 19 21 and can be correlated to marine oxygen isotopic stages MIS 22 23 Glacioisostatic marine terraces were mainly created during stillstands of the isostatic uplift 19 When eustasy was the main factor for the formation of marine terraces derived sea level fluctuations can indicate former climate changes This conclusion has to be treated with care as isostatic adjustments and tectonic activities can be extensively overcompensated by a eustatic sea level rise Thus in areas of both eustatic and isostatic or tectonic influences the course of the relative sea level curve can be complicated 24 Hence most of today s marine terrace sequences were formed by a combination of tectonic coastal uplift and Quaternary sea level fluctuations Jerky tectonic uplifts can also lead to marked terrace steps while smooth relative sea level changes may not result in obvious terraces and their formations are often not referred to as marine terraces 11 Processes edit Marine terraces often result from marine erosion along rocky coastlines 2 in temperate regions due to wave attack and sediment carried in the waves Erosion also takes place in connection with weathering and cavitation The speed of erosion is highly dependent on the shoreline material hardness of rock 10 the bathymetry and the bedrock properties and can be between only a few millimeters per year for granitic rocks and more than 10 metres 33 ft per year for volcanic ejecta 10 25 The retreat of the sea cliff generates a shore wave cut abrasion platform through the process of abrasion A relative change of the sea level leads to regressions or transgressions and eventually forms another terrace marine cut terrace at a different altitude while notches in the cliff face indicate short stillstands 25 It is believed that the terrace gradient increases with tidal range and decreases with rock resistance In addition the relationship between terrace width and the strength of the rock is inverse and higher rates of uplift and subsidence as well as a higher slope of the hinterland increases the number of terraces formed during a certain time 26 Furthermore shore platforms are formed by denudation and marine built terraces arise from accumulations of materials removed by shore erosion 2 Thus a marine terrace can be formed by both erosion and accumulation However there is an ongoing debate about the roles of wave erosion and weathering in the formation of shore platforms 10 Reef flats or uplifted coral reefs are another kind of marine terrace found in intertropical regions They are a result of biological activity shoreline advance and accumulation of reef materials 2 While a terrace sequence can date back hundreds of thousands of years its degradation is a rather fast process A deeper transgression of cliffs into the shoreline may completely destroy previous terraces but older terraces might be decayed 25 or covered by deposits colluvia or alluvial fans 3 Erosion and backwearing of slopes caused by incisive streams play another important role in this degradation process 25 Land and sea level history edit The total displacement of the shoreline relative to the age of the associated interglacial stage allows calculation of a mean uplift rate or the calculation of eustatic level at a particular time if the uplift is known In order to estimate vertical uplift the eustatic position of the considered paleo sea levels relative to the present one must be known as precisely as possible Current chronology relies principally on relative dating based on geomorphologic criteria but in all cases the shoreline angle of the marine terraces is associated with numerical ages The best represented terrace worldwide is the one correlated to the last interglacial maximum MIS 5e 27 28 29 Age of MISS 5e is arbitrarily fixed to range from 130 to 116 ka 30 but is demonstrated to range from 134 to 113 ka in Hawaii and Barbados with a peak from 128 to 116 ka on tectonically stable coastlines Older marine terraces well represented in worldwide sequences are those related to MIS 9 303 339 ka and 11 362 423 ka 31 Compilations show that sea level was 3 3 meters higher during MIS 5e MIS 9 and 11 than during the present one and 1 1 m to the present one during MIS 7 32 33 Consequently MIS 7 180 240 ka marine terraces are less pronounced and sometimes absent When the elevations of these terraces are higher than the uncertainties in paleo eustatic sea level mentioned for the Holocene and Late Pleistocene these uncertainties have no effect on overall interpretation Sequence can also occur where the accumulation of ice sheets have depressed the land so that when the ice sheets melts the land readjusts with time thus raising the height of the beaches glacio isostatic rebound and in places where co seismic uplift occur In the latter case the terrace are not correlated with sea level highstand even if co seismic terrace are known only for the Holocene Mapping and surveying edit nbsp Aerial photograph of the lowest marine terrace at Tongue Point New Zealand For exact interpretations of the morphology extensive datings surveying and mapping of marine terraces is applied This includes stereoscopic aerial photographic interpretation ca 1 10 000 25 000 11 on site inspections with topographic maps ca 1 10 000 and analysis of eroded and accumulated material Moreover the exact altitude can be determined with an aneroid barometer or preferably with a levelling instrument mounted on a tripod It should be measured with the accuracy of 1 cm 0 39 in and at about every 50 100 metres 160 330 ft depending on the topography In remote areas the techniques of photogrammetry and tacheometry can be applied 24 Correlation and dating editDifferent methods for dating and correlation of marine terraces can be used and combined Correlational dating edit The morphostratigraphic approach focuses especially in regions of marine regression on the altitude as the most important criterion to distinguish coastlines of different ages Moreover individual marine terraces can be correlated based on their size and continuity Also paleo soils as well as glacial fluvial eolian and periglacial landforms and sediments may be used to find correlations between terraces 24 On New Zealand s North Island for instance tephra and loess were used to date and correlate marine terraces 34 At the terminus advance of former glaciers marine terraces can be correlated by their size as their width decreases with age due to the slowly thawing glaciers along the coastline 24 The lithostratigraphic approach uses typical sequences of sediment and rock strata to prove sea level fluctuations on the basis of an alternation of terrestrial and marine sediments or littoral and shallow marine sediments Those strata show typical layers of transgressive and regressive patterns 24 However an unconformity in the sediment sequence might make this analysis difficult 35 The biostratigraphic approach uses remains of organisms which can indicate the age of a marine terrace For that often mollusc shells foraminifera or pollen are used Especially Mollusca can show specific properties depending on their depth of sedimentation Thus they can be used to estimate former water depths 24 Marine terraces are often correlated to marine oxygen isotopic stages MIS 22 and can also be roughly dated using their stratigraphic position 24 Direct dating edit There are various methods for the direct dating of marine terraces and their related materials The most common method is 14C radiocarbon dating 36 which has been used for example on the North Island of New Zealand to date several marine terraces 37 It utilizes terrestrial biogenic materials in coastal sediments such as mollusc shells by analyzing the 14C isotope 24 In some cases however dating based on the 230Th 234U ratio was applied in case detrital contamination or low uranium concentrations made finding a high resolution dating difficult 38 In a study in southern Italy paleomagnetism was used to carry out paleomagnetic datings 39 and luminescence dating OSL was used in different studies on the San Andreas Fault 40 and on the Quaternary Eupcheon Fault in South Korea 41 In the last decade the dating of marine terraces has been enhanced since the arrival of terrestrial cosmogenic nuclides method and particularly through the use of 10Be and 26Al cosmogenic isotopes produced on site 42 43 44 These isotopes record the duration of surface exposure to cosmic rays 45 This exposure age reflects the age of abandonment of a marine terrace by the sea In order to calculate the eustatic sea level for each dated terrace it is assumed that the eustatic sea level position corresponding to at least one marine terrace is known and that the uplift rate has remained essentially constant in each section 2 Relevance for other research areas edit nbsp Marine terraces south of Choapa River in Chile These terraces have been studied among others by Roland Paskoff Marine terraces play an important role in the research on tectonics and earthquakes They may show patterns and rates of tectonic uplift 40 44 46 and thus may be used to estimate the tectonic activity in a certain region 41 In some cases the exposed secondary landforms can be correlated with known seismic events such as the 1855 Wairarapa earthquake on the Wairarapa Fault near Wellington New Zealand which produced a 2 7 metre 8 ft 10 in uplift 47 This figure can be estimated from the vertical offset between raised shorelines in the area 48 Furthermore with the knowledge of eustatic sea level fluctuations the speed of isostatic uplift can be estimated 49 and eventually the change of relative sea levels for certain regions can be reconstructed Thus marine terraces also provide information for the research on climate change and trends in future sea level changes 10 50 When analyzing the morphology of marine terraces it must be considered that both eustasy and isostasy can have an influence on the formation process This way can be assessed whether there were changes in sea level or whether tectonic activities took place Prominent examples edit nbsp Quaternary marine terraces at Tongue Point New Zealand Raised beaches are found in a wide variety of coast and geodynamical background such as subduction on the Pacific coasts of South and North America passive margin of the Atlantic coast of South America 51 collision context on the Pacific coast of Kamchatka Papua New Guinea New Zealand Japan passive margin of the South China Sea coast on west facing Atlantic coasts such as Donegal Bay County Cork and County Kerry in Ireland Bude Widemouth Bay Crackington Haven Tintagel Perranporth and St Ives in Cornwall the Vale of Glamorgan Gower Peninsula Pembrokeshire and Cardigan Bay in Wales Jura and the Isle of Arran in Scotland Finistere in Brittany and Galicia in Northern Spain and at Squally Point in Eatonville Nova Scotia within the Cape Chignecto Provincial Park Other important sites include various coasts of New Zealand e g Turakirae Head near Wellington being one of the world s best and most thoroughly studied examples 47 48 52 Also along the Cook Strait in New Zealand there is a well defined sequence of uplifted marine terraces from the late Quaternary at Tongue Point It features a well preserved lower terrace from the last interglacial a widely eroded higher terrace from the penultimate interglacial and another still higher terrace which is nearly completely decayed 47 Furthermore on New Zealand s North Island at the eastern Bay of Plenty a sequence of seven marine terraces has been studied 12 37 nbsp Air photograph of the marine terraced coastline north of Santa Cruz California note Highway 1 running along the coast along the lower terraces Along many coasts of mainland and islands around the Pacific marine terraces are typical coastal features An especially prominent marine terraced coastline can be found north of Santa Cruz near Davenport California where terraces probably have been raised by repeated slip earthquakes on the San Andreas Fault 40 53 Hans Jenny famously researched the pygmy forests of the Mendocino and Sonoma county marine terraces The marine terrace s ecological staircase of Salt Point State Park is also bound by the San Andreas Fault Along the coasts of South America marine terraces are present 44 54 where the highest ones are situated where plate margins lie above subducted oceanic ridges and the highest and most rapid rates of uplift occur 7 46 At Cape Laundi Sumba Island Indonesia an ancient patch reef can be found at 475 m 1 558 ft above sea level as part of a sequence of coral reef terraces with eleven terraces being wider than 100 m 330 ft 55 The coral marine terraces at Huon Peninsula New Guinea which extend over 80 km 50 mi and rise over 600 m 2 000 ft above present sea level 56 are currently on UNESCO s tentative list for world heritage sites under the name Houn Terraces Stairway to the Past 57 Other considerable examples include marine terraces rising up to 360 m 1 180 ft on some Philippine Islands 58 and along the Mediterranean Coast of North Africa especially in Tunisia rising up to 400 m 1 300 ft 59 Related coastal geography editUplift can also be registered through tidal notch sequences Notches are often portrayed as lying at sea level however notch types actually form a continuum from wave notches formed in quiet conditions at sea level to surf notches formed in more turbulent conditions and as much as 2 m 6 6 ft above sea level 60 As stated above there was at least one higher sea level during the Holocene so that some notches may not contain a tectonic component in their formation See also editSimilar features Bench geology Fluvial terrace Strandflat Terrace geology Beach erosion and accretion Beach evolution Beach morphodynamics Beach nourishment Modern recession of beaches Paleoshoreline Fossil beach Coastal management to prevent coastal erosion and creation of beach Coastal and oceanic landforms Coastal development hazards Coastal erosion Coastal geography Coastal engineering Coastal and Estuarine Research Federation CERF Erosion Bioerosion Blowhole Natural arch Wave cut platform Longshore drift Deposition sediment Coastal sediment supply Sand dune stabilization SubmersionReferences edit a b Pinter N 2010 Coastal Terraces Sealevel and Active 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92 90039 5 Rosenbloom NA Anderson RS 1994 Hillslope and channel evolution in a marine terraced landscape Santa Cruz California Journal of Geophysical Research 99 B7 14013 14029 Bibcode 1994JGR 9914013R doi 10 1029 94jb00048 Pethick J 1984 An Introduction to Coastal Geomorphology Arnold amp Chapman amp Hall New York 260p a b c d e f Masselink G Hughes MG 2003 Introduction to Coastal Processes amp Geomorphology Arnold amp Oxford University Press Inc London 354p a b c Cantalamessa G Di Celma C 2003 Origin and chronology of Pleistocene marine terraces of Isla de la Plata and of flat gently dipping surfaces of the southern coast of Cabo San Lorenzo Manabi Ecuador Journal of South American Earth Sciences 16 8 633 648 Bibcode 2004JSAES 16 633C doi 10 1016 j jsames 2003 12 007 a b Ota Y Hull AG Berryman KR 1991 Coseismic Uplift of Holocene Marine Terraces in the Pakarae River Area Eastern North Island New Zealand Quaternary Research 35 3 331 346 Bibcode 1991QuRes 35 331O doi 10 1016 0033 5894 91 90049 B S2CID 129630764 Finkl CW 2005 Coastal Soils in Schwartz ML ed Encyclopedia of Coastal Science Springer Dordrecht pp 278 302 James N P Mountjoy E W Omura A 1971 An early Wisconsin reef Terrace at Barbados West Indies and its climatic implications Geological Society of America Bulletin 82 7 2011 2018 Bibcode 1971GSAB 82 2011J doi 10 1130 0016 7606 1971 82 2011 aewrta 2 0 co 2 Chappell J 1974 Geology of coral terraces Huon Peninsula New Guinea a study of Quaternary tectonic movements and sea Level changes Geological Society of America Bulletin 85 4 553 570 Bibcode 1974GSAB 85 553C doi 10 1130 0016 7606 1974 85 lt 553 gocthp gt 2 0 co 2 Bull W B 1985 Correlation of flights of global marine terraces In Morisawa M amp Hack J Editor 15th Annual Geomorphology Symposium Hemel Hempstead State University of New York at Binghamton pp 129 152 Ota Y 1986 Marine terraces as reference surfaces in late Quaternary tectonics studies examples from the Pacific Rim Royal Society of New Zealand 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Tectonics and Neotectonics Schwartz ML ed Encyclopedia of Coastal Science Springer Dordrecht pp 941 948 Saillard M Riotte J Regard V Violette A Herail G Audin A Riquelme R 2012 Beach ridges U Th dating in Tongoy bay and tectonic implications for a peninsula bay system Chile Journal of South American Earth Sciences 40 77 84 Bibcode 2012JSAES 40 77S doi 10 1016 j jsames 2012 09 001 Pirazzoli PA Radtke U Hantoro WS Jouannic C Hoang CT Causse C Borel Best M 1991 Quaternary Raised Coral Reef Terraces on Sumba Island Indonesia Science 252 5014 1834 1836 Bibcode 1991Sci 252 1834P doi 10 1126 science 252 5014 1834 PMID 17753260 S2CID 36558992 Chappell J 1974 Geology of Coral Terraces Huon Peninsula New Guinea A Study of Quaternary Tectonic Movements and Se Level Changes Geological Society of America Bulletin 85 4 553 570 Bibcode 1974GSAB 85 553C doi 10 1130 0016 7606 1974 85 lt 553 gocthp gt 2 0 co 2 UNESCO 2006 Huon Terraces Stairway to the Past from https whc unesco org en tentativelists 5066 13 04 2011 Eisma D 2005 Asia eastern Coastal Geomorphology in Schwartz ML ed Encyclopedia of Coastal Science Springer Dordrecht pp 67 71 Orme AR 2005 Africa Coastal Geomorphology in Schwartz ML ed Encyclopedia of Coastal Science Springer Dordrecht pp 9 21 Rust D Kershaw S 2000 Holocene tectonic uplift patternes in northeastern Sicily evidence from marine notches in coastal outcrops Marine Geology 167 1 2 105 126 Bibcode 2000MGeol 167 105R doi 10 1016 s0025 3227 00 00019 0 External links edit nbsp Wikimedia Commons has media related to Raised beaches Notes at NAHSTE US Geological Survey Marine Terrace Fact Sheet Wikimedia link USGS link Retrieved from https en wikipedia org w index php title Raised beach amp oldid 1212985295, wikipedia, wiki, book, books, library,

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