Brightseat Three (Paleocene of the United States)

Where: Prince Georges County, Maryland (39.0° N, 76.9° W: paleocoordinates 39.7° N, 54.8° W)

• 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

• Sequence of alternating fining and coarsening, unconsolidated, dark gray to olive or greenish gray, poorly sorted, micaceous, clayey and silty, fine to very fine quartz sand. Coarse grains and granules of quartz are scattered throughout the unit and small quartz pebbles and phosphate grains and pebbles also occur.

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: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Aporrhaid gastropod
Gastropoda
 Trochoidea - Skeneidae
Solariorbis "form A", Solariorbis laurelae n. sp.
Solariorbis "form A" Conrad 1865 snail
Solariorbis laurelae n. sp. snail
 Trochoidea - Ataphridae
Ataphrus glandula
 Opisthobranchia - Cylichnidae
Scaphander potomacensis n. sp.
Scaphander potomacensis n. sp. snail
100+ individuals Scaphander Priscaphander potomacensis
 Opisthobranchia - Retusidae
aff. Retusa sylvaerupis
aff. Retusa sylvaerupis snail
39+ Retusa Cylichnina sylvaerupis
 Opisthobranchia - Umbraculidae
? Umbraculum sp.
? Umbraculum sp. Schumacher 1817 snail
 Heterostropha - Architectonicidae
Architectonica "form B", Architectonica "form A", cf. Pseudomalaxis ripleyana
Architectonica "form B" Röding 1798 sundial
Architectonica Stellaxis
Architectonica "form A" Röding 1798 sundial
Architectonica Granosolarium
 Heterostropha - Pyramidellidae
Creonella obscuriplica n. sp., "Menestho "form A"" = Odostomia (Menestho), aff. Odostomia insignifica, Syrnola toulmini n. sp.
"Menestho "form A"" = Odostomia (Menestho) Möller 1842 snail
Menestho Evalea
aff. Odostomia insignifica Anderson and Hanna 1925 snail
Odostomia Brachystomia insignifica
Syrnola toulmini n. sp. snail
Syrnola Puposyrnola toulmini
 Heterostropha - Acteonidae
Acteon danicus n. sp., Tornatellaea texana, cf. Crenilabium elatum, Zikkuratia danica n. sp.
Acteon danicus n. sp. snail
Tornatellaea texana snail
200+ individuals Tornatellaea Tornatellaea texana
Zikkuratia danica n. sp. snail
 Heterostropha - Ringiculidae
Gilbertina texana
 Heterostropha - Mathildidae
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.
Mathilda "form B" Semper 1865 snail
Mathilda Mathilda
Mathilda marylandensis n. sp. snail
Mathilda Fimbriatella marylandensis
Mathilda crebricosta n. sp. snail
Mathilda Fimbriatella crebricosta
Mathilda "form C" Semper 1865 snail
Mathilda Mathilda
Mathilda "form A" Semper 1865 snail
Mathilda Mathilda
Mathilda kauffmani n. sp. snail
Mathilda Mathilda kauffmani
? Tuba sp. Lea 1823 snail
Acrocoelum richardsi n. sp. snail
 Epitonioidea - Epitoniidae
Cirsotrema "from B", ? Cirsotrema "form A"
Cirsotrema "from B" Mörch 1852 wentletrap
Cirsotrema Coroniscala
? Cirsotrema "form A" Mörch 1852 wentletrap
Cirsotrema Elegantiscala
 Vanikoroidea - Eulimidae
Eulima "form A", Eulima brightseatensis n. sp.
Eulima "form A" Risso 1826 snail
 Cerithioidea - Planaxidae
Medoriopsis marylandica
Medoriopsis marylandica snail
Medoriopsis Entomope marylandica
 Cerithioidea - Turritellidae
Haustator premortoni n. sp., Haustator "form A", ? Haustator gnoma n. sp., Sigmesalia palmerae n. sp., cf. Torcula sp., Torquesia prehumerosa n. sp.
Haustator premortoni n. sp. turret shell
200+ individuals
Haustator "form A" Monfort 1810 turret shell
? Haustator gnoma n. sp. turret shell
1000+ individuals
Sigmesalia palmerae n. sp. turret shell
cf. Torcula sp. Gray 1847 turret shell
Torquesia prehumerosa n. sp. turret shell
100+ individuals
 Sorbeoconcha - Littorinidae
Lacuna feorra n. sp.
Lacuna feorra n. sp. periwinkle
Lacuna Pseudocirsope new species feorra
 Sorbeoconcha - Naticidae
Neverita potomacensis n. sp.
Neverita potomacensis n. sp. moon snail
100+ individuals of Neverita Neverita potomacensis
 Sorbeoconcha - Vitrinellidae
Vitrinella clarkmartini n. sp., Cyclostremiscus sohli n. sp., "Circulus" "form A", ? Anticlimax gardnerae n. sp.
Vitrinella clarkmartini n. sp. snail
Vitrinella Vitrinellops new species clarkmartini
Cyclostremiscus sohli n. sp. snail
"Circulus" "form A" Jeffreys 1842 snail
 Sorbeoconcha - Iravadiidae
Pasitheola marylandensis n. sp.
 Sorbeoconcha - Tornidae
aff. Teinostoma barryi
aff. Teinostoma barryi snail
90+ individuals
 Neogastropoda - Pyropsidae
? Pyropsis sp.
? Pyropsis sp. Conrad 1860 snail
 Neogastropoda - Buccinidae
Lacinia pygmaea n. sp., Siphonalia potomacensis n. sp., Pseudoliva longicostata n. sp.
Lacinia pygmaea n. sp. true whelk
Siphonalia potomacensis n. sp. true whelk
Pseudoliva longicostata n. sp. true whelk
 Sorbeoconcha - Rostellariidae
cf. Calyptraphorus jacksoni
 Neotaenioglossa - Calyptraeidae
Calyptraea aldrichi n. sp.
Calyptraea aldrichi n. sp. slipper shell
100+ individuals