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

 Ptenoglossa - Epitoniidae
Cirsotrema "from B" Mörch 1852 wentletrap
Cirsotrema Coroniscala
? Cirsotrema "form A" Mörch 1852 wentletrap
Cirsotrema Elegantiscala
 Opisthobranchia - Umbraculidae
? Umbraculum sp. Schumacher 1817 snail
 Opisthobranchia - Retusidae
aff. Retusa sylvaerupis snail
39+ Retusa Cylichnina sylvaerupis
 Opisthobranchia - Cylichnidae
Scaphander potomacensis n. sp. snail
100+ individuals Scaphander Priscaphander potomacensis
 Neogastropoda - Buccinidae
Pseudoliva longicostata n. sp. true whelk
Siphonalia potomacensis n. sp. true whelk
Lacinia pygmaea n. sp. true whelk
 Neogastropoda - Tudiclidae
? Pyropsis sp. Conrad 1860 snail
 Stromboidea - Rostellariidae
 Littorinoidea - Littorinidae
Lacuna feorra n. sp. periwinkle
Lacuna Pseudocirsope new species feorra
 Vanikoroidea - Eulimidae
Eulima "form A" Risso 1826 snail
 Naticoidea - Naticidae
Neverita potomacensis n. sp. moon snail
100+ individuals of Neverita Neverita potomacensis
 Calyptraeoidea - Calyptraeidae
Calyptraea aldrichi n. sp. slipper shell
100+ individuals
 Rissooidea - Vitrinellidae
"Circulus" "form A" Jeffreys 1842 snail
Vitrinella clarkmartini n. sp. snail
Vitrinella Vitrinellops new species clarkmartini
 Truncatelloidea - Tornidae
aff. Teinostoma barryi snail
90+ individuals
 Truncatelloidea - Iravadiidae
 Sorbeoconcha - Planaxidae
Medoriopsis marylandica snail
Medoriopsis Entomope marylandica
 Sorbeoconcha - Turritellidae
cf. Torcula sp. Gray 1847 turret shell
Sigmesalia palmerae n. sp. turret shell
Torquesia prehumerosa n. sp. turret shell
100+ individuals
Haustator premortoni n. sp. turret shell
200+ individuals
Haustator "form A" Monfort 1810 turret shell
? Haustator gnoma n. sp. turret shell
1000+ individuals
 Heterostropha - Acteonidae
Zikkuratia danica n. sp. snail
Tornatellaea texana snail
200+ individuals Tornatellaea Tornatellaea texana
Acteon danicus n. sp. snail
 Heterostropha - Ringiculidae
 Heterostropha - Mathildidae
? Tuba sp. Lea 1823 snail
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
Acrocoelum richardsi n. sp. snail
 Pyramidelloidea - Pyramidellidae
Syrnola toulmini n. sp. snail
Syrnola Puposyrnola toulmini
aff. Odostomia insignifica snail
Odostomia Brachystomia insignifica
"Menestho "form A"" = Odostomia (Menestho) Möller 1842 snail
Menestho Evalea
 Architectonicoidea - Architectonicidae
Architectonica "form B" Röding 1798 sundial
Architectonica Stellaxis
Architectonica "form A" Röding 1798 sundial
Architectonica Granosolarium
 Turbinoidea - Turbinidae
Solariorbis "form A" Conrad 1865 snail
Solariorbis laurelae n. sp. snail
 Trochoidea - Ataphridae