fbpx
Wikipedia

Aztec Sandstone

March 15, 2023

The Aztec Sandstone is an Early Jurassic geological formation of primarily eolian sand from which fossil pterosaur tracks have been recovered.[4] The formation is exposed in the Mojave Desert of Arizona, California and Nevada. Aztec Sandstone is named after the Aztec Tank[5], a lake in the Spring Mountain region of Nevada.

Aztec Sandstone
Stratigraphic range: Early Jurassic
Outcrop of the Aztec Sandstone at Red Rock Canyon National Conservation Area near Las Vegas, Nevada
TypeSedimentary
UnderliesWillow Tank Formation[1]
OverliesChinle Formation
AreaNevada,[2] Arizona, California[3]
Thickness2,100 ft (640 m) in Goodsprings quadrangle[2]
2,500 ft (760 m) in Muddy Mountain area[1]
Lithology
Primarysandstone
Otherarenite, sand
Location
Coordinates35°24′N 115°30′W / 35.4°N 115.5°W / 35.4; -115.5Coordinates: 35°24′N 115°30′W / 35.4°N 115.5°W / 35.4; -115.5
Approximate paleocoordinates20°48′N 53°24′W / 20.8°N 53.4°W / 20.8; -53.4
RegionMojave Desert
Country United States
Type section
Named byD. F. Hewett[2]
Year defined1931
Aztec Sandstone (the United States)
Aztec Sandstone (California)

Description

The Aztec Sandstone is made up of two units. The lower resistant sandstone unit (100 metres (330 ft) thick) is tan to off-white in outcrops but pinkish in fresh exposures. Crosbedded lenses can easily be observed. Frosted and pitted quartz grains well-cemented by silica are described by Evans in 1958 and 1971. The upper and less resistant unit (200m thick) consists of alternating white quartz arenites and red to brown silty sands.[6]

Vertebrate paleofauna

The formation has provided the following ichnofossils attributed to vertebrates:[4]

Ichnofossils of the Aztec Sandstone
Genus Species Location Member Abundance Notes Images
Anchisauripus[7] Reclassified as Grallator
Brasilichnium
Grallator[8]
 
Navahopus
Octopodichnus
Pteraichnus[9]
Skolithos
 
Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

See also

References

  1. ^ a b Longwell, C.R. (1949). "Structure of the Northern Muddy Mountain Area, Nevada". Geological Society of America Bulletin. 60 (5): 923–968. Bibcode:1949GSAB...60..923L. doi:10.1130/0016-7606(1949)60[923:SOTNMM]2.0.CO;2. ISSN 0016-7606. Wikidata Q60182382.
  2. ^ a b c Hewett, D.F. (1931). "Geology and ore deposits of the Goodsprings quadrangle, Nevada" (PDF). Geological Survey Professional Paper (162). doi:10.3133/PP162. ISSN 0096-0446. Wikidata Q61823480. (incl. geologic map, scale 1:62,500)
  3. ^ Jennings, C.W., 1961, Geologic map of California; Kingman sheet: California Division of Mines and Geology, scale 1:250,000
  4. ^ a b Aztec Sandstone at Fossilworks.org
  5. ^ "Geolex — Aztec publications". ngmdb.usgs.gov. Retrieved 2023-03-14.
  6. ^ Mescal Range at Fossilworks.org
  7. ^ Listed as "cf. Anchisauripus" in "Appendix: Summary of the Mesozoic Reptilian Fossils of California," Hilton (2003) p. 265
  8. ^ Listed as "cf. Grallator" in "Appendix: Summary of the Mesozoic Reptilian Fossils of California," in Hilton (2003) p. 265
  9. ^ Lockley, et al. (2008)

Bibliography

 
Wikimedia Commons has media related to Aztec Sandstone.
  • Bonde, J. W.; Varricchio, D. J.; Jackson, F. D.; Loope, D. B.; Shirk, A. M. (2008). E. M. Duebendorfer; E. I. Smith (eds.). Dinosaurs and dunes! Sedimentology and paleontology of the Mesozoic in the Valley of Fire State Park. Field Guide to Plutons, Volcanoes, Faults, Reefs, Dinosaurs, and Possible Glaciation in Selected Areas of Arizona, California, and Nevada. Vol. 11. pp. 249–262. doi:10.1130/2008.FLD011(11). ISBN 978-0-81-375611-0. Wikidata Q95597606.
  • Lockley, M.; Harris, J.D.; and Mitchell, L. 2008. "A global overview of pterosaur ichnology: tracksite distribution in space and time." Zitteliana. B28. p. 187-198. ISSN 1612-4138.
  • Porter, M.L. (August 1987). "Sedimentology of an ancient erg margin: the Lower Jurassic Aztec Sandstone, southern Nevada and southern California". Sedimentology. 34 (4): 661–680. Bibcode:1987Sedim..34..661P. doi:10.1111/J.1365-3091.1987.TB00793.X. ISSN 0037-0746. Wikidata Q97000543.
  • Hilton, Richard P. 2003. Dinosaurs and Other Mesozoic Reptiles of California. Berkeley: University of California Press. 318 pp.

Further reading

  • R. E. Reynolds. 1986. California trackways from the Lower Jurassic Aztec Sandstone. In D. D. Gillette (ed.), First International Symposium on Dinosaur Tracks and Traces. Abstracts with Program 24

March 15, 2023
aztec, sandstone, early, jurassic, geological, formation, primarily, eolian, sand, from, which, fossil, pterosaur, tracks, have, been, recovered, formation, exposed, mojave, desert, arizona, california, nevada, named, after, aztec, tank, lake, spring, mountain. The Aztec Sandstone is an Early Jurassic geological formation of primarily eolian sand from which fossil pterosaur tracks have been recovered 4 The formation is exposed in the Mojave Desert of Arizona California and Nevada Aztec Sandstone is named after the Aztec Tank 5 a lake in the Spring Mountain region of Nevada Aztec SandstoneStratigraphic range Early JurassicOutcrop of the Aztec Sandstone at Red Rock Canyon National Conservation Area near Las Vegas NevadaTypeSedimentaryUnderliesWillow Tank Formation 1 OverliesChinle FormationAreaNevada 2 Arizona California 3 Thickness2 100 ft 640 m in Goodsprings quadrangle 2 2 500 ft 760 m in Muddy Mountain area 1 LithologyPrimarysandstoneOtherarenite sandLocationCoordinates35 24 N 115 30 W 35 4 N 115 5 W 35 4 115 5 Coordinates 35 24 N 115 30 W 35 4 N 115 5 W 35 4 115 5Approximate paleocoordinates20 48 N 53 24 W 20 8 N 53 4 W 20 8 53 4RegionMojave DesertCountry United StatesType sectionNamed byD F Hewett 2 Year defined1931Aztec Sandstone the United States Show map of the United StatesAztec Sandstone California Show map of California Contents 1 Description 2 Vertebrate paleofauna 3 See also 4 References 4 1 Bibliography 5 Further readingDescription EditThe Aztec Sandstone is made up of two units The lower resistant sandstone unit 100 metres 330 ft thick is tan to off white in outcrops but pinkish in fresh exposures Crosbedded lenses can easily be observed Frosted and pitted quartz grains well cemented by silica are described by Evans in 1958 and 1971 The upper and less resistant unit 200m thick consists of alternating white quartz arenites and red to brown silty sands 6 Vertebrate paleofauna EditThe formation has provided the following ichnofossils attributed to vertebrates 4 Ichnofossils of the Aztec SandstoneGenus Species Location Member Abundance Notes ImagesAnchisauripus 7 Reclassified as GrallatorBrasilichniumGrallator 8 NavahopusOctopodichnusPteraichnus 9 Skolithos Color keyTaxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon Notes Uncertain or tentative taxa are in small text crossed out taxa are discredited See also EditList of fossil sites List of fossiliferous stratigraphic units in California List of fossiliferous stratigraphic units in NevadaReferences Edit a b Longwell C R 1949 Structure of the Northern Muddy Mountain Area Nevada Geological Society of America Bulletin 60 5 923 968 Bibcode 1949GSAB 60 923L doi 10 1130 0016 7606 1949 60 923 SOTNMM 2 0 CO 2 ISSN 0016 7606 Wikidata Q60182382 a b c Hewett D F 1931 Geology and ore deposits of the Goodsprings quadrangle Nevada PDF Geological Survey Professional Paper 162 doi 10 3133 PP162 ISSN 0096 0446 Wikidata Q61823480 incl geologic map scale 1 62 500 Jennings C W 1961 Geologic map of California Kingman sheet California Division of Mines and Geology scale 1 250 000 a b Aztec Sandstone at Fossilworks org Geolex Aztec publications ngmdb usgs gov Retrieved 2023 03 14 Mescal Range at Fossilworks org Listed as cf Anchisauripus in Appendix Summary of the Mesozoic Reptilian Fossils of California Hilton 2003 p 265 Listed as cf Grallator in Appendix Summary of the Mesozoic Reptilian Fossils of California in Hilton 2003 p 265 Lockley et al 2008 Bibliography Edit Wikimedia Commons has media related to Aztec Sandstone Bonde J W Varricchio D J Jackson F D Loope D B Shirk A M 2008 E M Duebendorfer E I Smith eds Dinosaurs and dunes Sedimentology and paleontology of the Mesozoic in the Valley of Fire State Park Field Guide to Plutons Volcanoes Faults Reefs Dinosaurs and Possible Glaciation in Selected Areas of Arizona California and Nevada Vol 11 pp 249 262 doi 10 1130 2008 FLD011 11 ISBN 978 0 81 375611 0 Wikidata Q95597606 Lockley M Harris J D and Mitchell L 2008 A global overview of pterosaur ichnology tracksite distribution in space and time Zitteliana B28 p 187 198 ISSN 1612 4138 Porter M L August 1987 Sedimentology of an ancient erg margin the Lower Jurassic Aztec Sandstone southern Nevada and southern California Sedimentology 34 4 661 680 Bibcode 1987Sedim 34 661P doi 10 1111 J 1365 3091 1987 TB00793 X ISSN 0037 0746 Wikidata Q97000543 Hilton Richard P 2003 Dinosaurs and Other Mesozoic Reptiles of California Berkeley University of California Press 318 pp Further reading EditR E Reynolds 1986 California trackways from the Lower Jurassic Aztec Sandstone In D D Gillette ed First International Symposium on Dinosaur Tracks and Traces Abstracts with Program 24 Retrieved from https en wikipedia org w index php title Aztec Sandstone amp oldid 1144619451, wikipedia, wiki, book, books, library,

article

, read, download, free, free download, mp3, video, mp4, 3gp, jpg, jpeg, gif, png, picture, music, song, movie, book, game, games.