Where: Prince Georges County, Maryland (39.0° N, 76.9° W)
• Paleocoordinates: 40.4° N, 43.1° W (Wright 2013)
• coordinate based on nearby landmark
• local area-level geographic resolution
When: Brightseat Formation (Pamunkey Group), Danian (66.0 - 61.6 Ma)
• Brightseat rest unconformably upon Cretaceous Severn Formation and is overlain unconformably by the Paleocene (Thanetian) Aquia Formation.
• group of beds-level stratigraphic resolution
Environment/lithology: shallow subtidal; unlithified, bioturbated, fine, micaceous, gray, green, silty sandstone
Primary reference: D. L. Govoni. 1983. Gastropod Molluscs from the Brightseat Formation (Paleocene: Danian) of Maryland. [A. Miller/J. Sessa]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 83135: authorized by Arnold Miller, entered by Jocelyn Sessa on 08.08.2008
Creative Commons license: CC0 (CC0)
Taxonomic list
unclassified | |
Gastropoda | |
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Gilbertina texana snail | |
"Menestho "form A"" = Odostomia (Menestho), aff. Odostomia insignifica, Creonella obscuriplica n. sp., Syrnola toulmini n. sp.
Creonella obscuriplica n. sp. snail | |
Mathilda "form B", Mathilda marylandensis n. sp., Mathilda crebricosta n. sp., Mathilda "form C", Mathilda "form A", Mathilda kauffmani n. sp., ? Tuba sp., Acrocoelum richardsi n. sp.
? Tuba sp. Lea 1823 snail
Acrocoelum richardsi n. sp. snail | |
Solariorbis "form A" Conrad 1865 snail
Solariorbis laurelae n. sp. snail | |
Ataphrus glandula snail | |
Calyptraea aldrichi n. sp.
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Neverita potomacensis n. sp.
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Lacuna feorra n. sp.
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Cyclostremiscus sohli n. sp., Vitrinella clarkmartini n. sp., ? Anticlimax gardnerae n. sp., "Circulus" "form A"
Cyclostremiscus sohli n. sp. snail
? Anticlimax gardnerae n. sp. snail
"Circulus" "form A" Jeffreys 1842 snail | |
Pasitheola marylandensis n. sp.
Pasitheola marylandensis n. sp. snail | |
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Siphonalia potomacensis n. sp. true whelk
Pseudoliva longicostata n. sp. true whelk
Lacinia pygmaea n. sp. true whelk | |
? Pyropsis sp. Conrad 1860 snail | |
cf. Calyptraphorus jacksoni Clark 1895 snail | |
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cf. Torcula sp., "Torquesia prehumerosa n. sp." = Turritella (Torquesia), Sigmesalia palmerae n. sp., Haustator premortoni n. sp., Haustator "form A", ? Haustator gnoma n. sp.
cf. Torcula sp. Gray 1847 turret shell
Sigmesalia palmerae n. sp. turret shell
Haustator "form A" Monfort 1810 turret shell | |
Eulima "form A" Risso 1826 snail
Eulima brightseatensis n. sp. snail | |
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Scaphander potomacensis n. sp.
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? Umbraculum sp. Schumacher 1817 snail |