The Michigan Basin was a shallow marine shelf during the middle Devonian, located between 30º South and 20º North latitude in central Laurasia. According to stratigraphic and paleontological examination, the sediments of the Gravel Point Formation were deposited in a shallow lagoonal reef environment.[1]
^ abcdefghijklmnopqrMohan, Joseph (November 2013). "A Paleoenvironmental Analysis of the Middle Devonian Gravel Point Formation, Western Michigan". The Professional Geologist. 50 (6): 12–16.
^ abcdefStack, Jack; Sallan, Lauren (2018-09-20). "An examination of the Devonian fishes of Michigan". PeerJ. 6 (2): e5636. doi:10.7717/peerj.5636. PMC6151260. PMID 30258725. S2CID 52843222.
^ abcdefghijklmnopqrstImbrie, John (1959). "Brachiopods of the Traverse group (Devonian) of Michigan. Part 1, Dalmanellacea, Pentameracea, Strophomenacea, Orthotetacea, Chonetacea, and Productacea. Bulletin of the AMNH ; v. 116, article 4". hdl:2246/1258. {{cite journal}}: Cite journal requires |journal= (help)
^Rogers, Frederick S.; Pitrat, Charles W. (May 1987). "Distribution of Tylothyris (Brachiopoda) and its occurrence in the Traverse Group (Middle Devonian) of Michigan". Journal of Paleontology. 61 (3): 494–507. doi:10.1017/S0022336000028651. ISSN 0022-3360. S2CID 130922140.
^ abcdefWatkins, J. Lloyd (1959). "Middle Devonian Auloporid Corals from the Traverse Group of Michigan". Journal of Paleontology. 33 (5): 793–808. ISSN 0022-3360. JSTOR 1300915.
^ abcdefgStumm, Erwin (1953). "Trilobites of the Devonian Traverse Group of Michigan" (PDF). University of Michigan Press - Museum of Paleontology.
Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
This article about a specific stratigraphicformation in Michigan is a stub. You can help Wikipedia by expanding it.
gravel, point, formation, geologic, formation, western, michigan, preserves, fossils, dating, back, middle, devonian, period, correlates, with, long, lake, limestone, alpena, limestone, stratigraphic, range, middle, devonian, givetian, preꞒ, fossiliferous, lim. The Gravel Point Formation is a geologic formation in western Michigan It preserves fossils dating back to the middle Devonian period and correlates with the Long Lake Limestone and Alpena Limestone 1 Gravel Point FormationStratigraphic range Middle Devonian Givetian 1 PreꞒ Ꞓ O S D C P T J K Pg N Fossiliferous limestone from the Gravel Point FormationTypeGeological formationUnit ofTraverse GroupLithologyPrimaryLimestoneLocationRegion MichiganCountry United States Contents 1 Description 2 Fossil content 2 1 Vertebrates 2 1 1 Acanthodians 2 1 2 Bony fish 2 1 3 Placoderms 2 2 Invertebrates 2 2 1 Brachiopods 2 2 2 Bryozoans 2 2 3 Cnidarians 2 2 4 Sponges 2 2 5 Tentaculitans 2 2 6 Trilobites 2 3 Flora 2 3 1 Acritarchs 2 3 2 Plants 3 See also 4 ReferencesDescription editThe Michigan Basin was a shallow marine shelf during the middle Devonian located between 30º South and 20º North latitude in central Laurasia According to stratigraphic and paleontological examination the sediments of the Gravel Point Formation were deposited in a shallow lagoonal reef environment 1 Fossil content editVertebrates edit Acanthodians edit Acanthodians of the Gravel Point FormationGenus Species Presence Material Notes ImagesGyracanthus G sp South Point Gravel Point Little Traverse Bay Charlevoix County 2 A single specimen UMMP 1329 2 A gyracanthid nbsp Bony fish edit Bony fish of the Gravel Point FormationGenus Species Presence Material Notes Images Onychodus O sp South Point Gravel Point Little Traverse Bay Charlevoix County 2 A single specimen UMMP 14370 2 An onychodontiform nbsp Placoderms edit Placoderms of the Gravel Point FormationGenus Species Presence Material Notes ImagesHolonemiid South Point Gravel Point Little Traverse Bay Charlevoix County 2 A single specimen UMMP 3129 2 Invertebrates edit Several species of ostracods an unidentified arthropod hook crinoid columnals and several species of polychaetes and scolecodonts are known from the formation 1 Brachiopods edit Brachiopods of the Gravel Point FormationGenus Species Presence Material Notes ImagesAtrypa A corrugata 1 Douvillina D sp Lower part of the formation 3 2 specimens 3 Heteralosia H sp B 2 pedicle valves 3 Leptalosia L radicans 3 Also found in the Norway Point Alpena Four Mile Dam Genshaw Arkona and Hungry Hollow formations Longispina L emmetensis 3 Also found in the Alpena Limestone and Four Mile Dam Formation Mucrospirifer M latus 1 A spiriferid M sp 1 A spiriferid Oligorhachis O oligorhachis 3 Also found in the Four Mile Dam Formation Orthopleura O sp A Large Atrypa zone 3 One specimen U S N M no 124258 3 O sp B Upper Blue shale 3 One specimen U S N M no 124280 3 Pentamerella P aftonensis Gorbut Member 3 P alpenensis 3 Also found in the Alpena Limestone and Four Mile Dam Formation P sp D A small collection of large shells the largest being 38 millimeters 3 Pholidostrophia P geniculata 3 Also found in the Alpena Widder and Hungry Hollow formations Pseudoatrypa P keslingi 1 Schuchertella S anomala 3 Possibly also found in the Four Mile Dam Formation Strophodonta S costata 1 A strophomenid S cf S erotica 1 A strophomenid S erratica 3 Also found in the Alpena Limestone and Four Mile Dam Formation S fissicosta Upper part of the formation 3 Also found in the Four Mile Dam Formation S nanus 3 Also found in the Alpena Limestone and Four Mile Dam Formation S titan titan 3 Also known from the Alpena Limestone Truncalosia T gibbosa 3 Also found in the Alpena Genshaw Norway Point Petoskey and Potter Farm formations the Arkona Shale and the Hamilton Group Tylothyris T subvaricosa 4 Also found in the Cedar Valley Milwaukee Mineola Bell Rockport Quarry Ferron Point Genshaw Alpena Norway Point and Potter Farm formations Bryozoans edit Bryozoans of the Gravel Point FormationGenus Species Presence Material Notes ImagesFenestellapolypore F magnifica 1 A fenestellid Cnidarians edit Cnidarians of the Gravel Point FormationGenus Species Presence Material Notes ImagesAulocystis A alectiformis 5 Also found in the Alpena Limestone A fenestrata 6 specimens 5 Also found in the Alpena Limestone Aulopora A conferta 5 Also found in the Bell Ferron Point Genshaw Alpena Four Mile Dam Potter Farm Petoskey and Hungry Hollow formations A socialis Upper part of the formation 5 Favosites F mammilatus 1 A tabulate coral Pachyphragma P concentricum 5 Also found in the Ferron Point Four Mile Dam and Alpena formations P erectum 5 Also found in the Potter Farm and Petoskey formations Sponges edit Sponges of the Gravel Point FormationGenus Species Presence Material Notes ImagesParallelopora P winchelli 1 A stromatoporoid Tentaculitans edit Tentaculitans of the Gravel Point FormationGenus Species Presence Material Notes ImagesTentaculites T sp 1 A tentaculitid nbsp Trilobites edit 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 Trilobites of the Gravel Point FormationGenus Species Presence Material Notes ImagesAncyropyge A romingeri Longispina emmetensis zone 6 Dechenella D Basidechenella pulchra 6 Also found in the Alpena Limestone and Dock Street clay of the Four Mile Dam Formation Eldredgeops E rana alpenensis 6 Originally reported as Phacops rana alpenensis Also found in the Alpena Limestone nbsp Greenops G aequituberculatus 6 Also found in the Norway Point and Four Mile Dam formations G traversensis 6 Also found in the Dock Street clay of the Four Mile Dam Formation Phacops P rana alpenensis 6 Reassigned to the genus Eldredgeops Proetus P Crassiproetus traversensis 6 Also found in the Four Mile Dam Formation Flora edit Algal colonies are known from the formation 1 Acritarchs edit Acritarchs of the Gravel Point FormationGenus Species Presence Material Notes ImagesLophosphaeridium L sp 1 Tasmanites T sp 1 Plants edit Plants of the Gravel Point FormationGenus Species Presence Material Notes ImagesAncyrospora A sp Miospores 1 See also edit nbsp Earth sciences portal nbsp Michigan portal nbsp Paleontology portalList of fossiliferous stratigraphic units in MichiganReferences edit a b c d e f g h i j k l m n o p q r Mohan Joseph November 2013 A Paleoenvironmental Analysis of the Middle Devonian Gravel Point Formation Western Michigan The Professional Geologist 50 6 12 16 a b c d e f Stack Jack Sallan Lauren 2018 09 20 An examination of the Devonian fishes of Michigan PeerJ 6 2 e5636 doi 10 7717 peerj 5636 PMC 6151260 PMID 30258725 S2CID 52843222 a b c d e f g h i j k l m n o p q r s t Imbrie John 1959 Brachiopods of the Traverse group Devonian of Michigan Part 1 Dalmanellacea Pentameracea Strophomenacea Orthotetacea Chonetacea and Productacea Bulletin of the AMNH v 116 article 4 hdl 2246 1258 a href Template Cite journal html title Template Cite journal cite journal a Cite journal requires journal help Rogers Frederick S Pitrat Charles W May 1987 Distribution of Tylothyris Brachiopoda and its occurrence in the Traverse Group Middle Devonian of Michigan Journal of Paleontology 61 3 494 507 doi 10 1017 S0022336000028651 ISSN 0022 3360 S2CID 130922140 a b c d e f Watkins J Lloyd 1959 Middle Devonian Auloporid Corals from the Traverse Group of Michigan Journal of Paleontology 33 5 793 808 ISSN 0022 3360 JSTOR 1300915 a b c d e f g Stumm Erwin 1953 Trilobites of the Devonian Traverse Group of Michigan PDF University of Michigan Press Museum of Paleontology Various Contributors to the Paleobiology Database Fossilworks Gateway to the Paleobiology Database Retrieved 17 December 2021 nbsp This article about a specific stratigraphic formation in Michigan is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Gravel Point Formation amp oldid 1206239826, wikipedia, wiki, book, books, library,
