USNM Hartman Locality L6208 (Cretaceous of the United States)

Where: Garfield County, Montana (47.6° N, 106.9° W: paleocoordinates 54.5° N, 79.5° W)

• coordinate stated in text

When: Hell Creek Formation, Maastrichtian (72.1 - 66.0 Ma)

• about 29.8 m above the base of the Hell Creek Formation.

Environment/lithology: fluvial; sandstone

• light olive gray (5Y 6/ 1 to 5Y 5/2) to yellowish gray (5Y 7/2), poorly sorted, fossiliferous, clay clast-bearing and opaque mineral-bearing, fine-grained sandstone matrix

Size class: mesofossils

Collected by Hartman, J.H.; reposited in the USNM

Primary reference: B. Roth and J. H. Hartman. 1998. Probable Cerion (Gastropoda: Pulmonata) from Uppermost Cretaceous Hell Creek Formation, Garfield County, Montana. PaleoBios 18(2&3):16-20 [P. Holroyd/P. Holroyd]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 192041: authorized by Patricia Holroyd, entered by Patricia Holroyd on 03.03.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Bivalvia
 Cardiida - Sphaeriidae
Sphaerium beckmani, Sphaerium cf. subellipticum
Sphaerium beckmani fingernail clam
 Unionida - Iridinidae
Pleiodon "sp. 1"
Pleiodon "sp. 1" Conrad 1834 clam
 Unionida - Unionidae
"Plesielliptio cf. brachyopisthus" = Elliptio (Plesielliptio), "Plesielliptio postbiplicatus" = Elliptio (Plesielliptio), "Plesielliptio ? whitfieldi" = Elliptio (Plesielliptio), Pleurobema cryptorhynchus, cf. Strophitus sp., Quadrula cylindricoides, Proparreysia percorrugata
"Plesielliptio cf. brachyopisthus" = Elliptio (Plesielliptio) freshwater mussel
"Plesielliptio postbiplicatus" = Elliptio (Plesielliptio) freshwater mussel
"Plesielliptio ? whitfieldi" = Elliptio (Plesielliptio) freshwater mussel
Pleurobema cryptorhynchus freshwater mussel
cf. Strophitus sp. Rafinesque 1820 freshwater mussel
Quadrula cylindricoides freshwater mussel
Proparreysia percorrugata freshwater mussel
Gastropoda
  -
Gastropoda "New genus A limneaformis"
 Heterostropha - Physidae
Physa sp.
Physa sp. Draparnaud 1801 snail
 Sorbeoconcha - Hydrobiidae
Hydrobia cf. anthonyi
 Architaenioglossa - Viviparidae
Lioplacodes tenuicarinata, Viviparus thompsoni, Viviparus "sp. form A", Campeloma "sp. form A", Campeloma sp.
Viviparus "sp. form A" Montfort 1810 snail
Campeloma "sp. form A" Rafinesque 1819 snail
Campeloma sp. Rafinesque 1819 snail
Cerion
  -
Cerion acherontis n. sp.
Cerion acherontis n. sp. Roth and Hartman 1998