USGS 14580 (Cretaceous of the United States)

Where: Tarrant County, Texas (32.7° N, 97.4° W: paleocoordinates 31.2° N, 62.2° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Eagle Ford Formation, Cenomanian (100.5 - 93.9 Ma)

• From the basal 10 ft

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, calcareous sandstone and shale

• Sandstone, thin, platy; interbedded shale; lrg. ovate concretionary fine calcareous sandstone, 1 ft. thick, showing effects of crushing by pressure from above.

Size class: macrofossils

Reposited in the USGS

Collection methods: surface (in situ), mechanical,

Primary reference: L. W. Stephenson. 1955. Basal Eagle Ford fauna (Cenomanian) in Johnson and Tarrant Counties, Texas. United States Geological Survey Professional Paper 274-C:53-67 [J. Alroy/M. Sommers/A. Clement]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 2122: authorized by John Alroy, entered by Mike Sommers on 22.06.1999, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

• abundance data inconsistent: sometimes quantitative, other times qualitative, or not even given. see comment field for info.
Show authors, comments, and common names
Gastropoda
 Sorbeoconcha - Aporrhaidae
Lispodesthes lirata
Lispodesthes lirata snail
n. sp., "considerable numbers"
Cephalopoda
 Ammonitida - Acanthoceratidae
"Tarrantoceras rotatile" = Tarrantoceras (Tarrantoceras) sellardsi, Acanthoceras amphibolum
"Tarrantoceras rotatile" = Tarrantoceras (Tarrantoceras) sellardsi Adkins 1928 ammonite
n. sp.
Acanthoceras amphibolum Morrow 1935 ammonite
"considerable numbers"
Bivalvia
 Pholadida - Corbulidae
? Caestocorbula sp.
? Caestocorbula sp. Vincent 1910 clam
internal molds w/remnants of shell substance - originally entered as "? Caestocorula sp."
 Myalinida - Inoceramidae
Inoceramus arvanus
Inoceramus arvanus Stephenson 1953 clam