Bed R, Stone City Bluff (type locality Stone City beds) (Eocene to of the United States)

Where: Brazos County, Texas (30.6° N, 96.5° W: paleocoordinates 32.4° N, 86.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Stone City Formation, Lutetian to Lutetian (47.8 - 38.0 Ma)

• collection from three interbedded lenticular units becoming more glauconitic and fossiliferous in basal 1.5 ft.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; poorly lithified, gypsiferous, shelly/skeletal, brown, gray, yellow, carbonaceous shale and poorly lithified, glauconitic, micaceous, shelly/skeletal, gray sandstone

• three interbedded units: (1) unctous when wet or coherent with dry, brownish-gray, weathering to dark yellowish-orange or moderate-brown, laminated, carbonaceous, shale containing occasional layers of fossils and flakes of gypsum; (2) crumbly to resistant, olive-gray, thinly bedded, fossiliferous, glauconitic, muscovitic, very fine-grained sandstone; (3) loose to crumbly, dark yellowish-orange, thin-bedded, nonfossiliferous, gypsiferous, ferruginous silt

Size class: macrofossils

Primary reference: H. B. Stenzel, E. K. Krause, and J. T. Twining. 1957. Pelecypoda from the type locality of the Stone City beds (Middle Eocene) of Texas. University of Texas Publication (5704) [M. Kosnik/M. Kosnik/M. Kosnik]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 41435: authorized by Arnold Miller, entered by Karen Layou on 14.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Pectinida - Anomiidae
Anomia ephippioides Gabb 1860 jingle
rare
 Carditida - Carditidae
"Venericardia (Venericor) planicosta" = Venericor planicosta
"Venericardia (Venericor) planicosta" = Venericor planicosta Lamarck 1801 clam
frequent; V. (Venericor) planicosta densata
 Cardiida - Tellinidae
Tellina (Eurytellina) mooreana Gabb 1860 tellin clam
rare
 Protobranchia - Nuculanidae
Orthoyoldia petropolitana pointed nut clam
rare