USGS 11740 (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 and platy, interbedded with shale; lrg. ovate concretionary fine grained calcareous sandstone (fossiliferous), 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 2120: 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
Bivalvia
 Ostreida - Ostreidae
Ostrea sp.
Ostrea sp. Linnaeus 1758 oyster
"many small and fragmentary shells"
 Myalinida - Inoceramidae
Inoceramus arvanus
Inoceramus arvanus Stephenson 1953 clam
 Cardiida - Cardiidae
"? Brevicardium sp." = Nemocardium (Brevicardium)
"? Brevicardium sp." = Nemocardium (Brevicardium) Stephenson 1941 cockle
right valve - originally entered as "? Brevicardium sp."
 Pholadida - Corbulidae
? Caestocorbula sp.
? Caestocorbula sp. Vincent 1910 clam
internal molds w/ remnants of shell substance - originally entered as "? Caestocorbula sp."
Cephalopoda
 Ammonitida - Desmoceratidae
Desmoceratidae indet.
Desmoceratidae indet. Zittel 1895 ammonite
sm., incomplete, too immature to assign genus name
 Ammonitida - Acanthoceratidae
"Tarrantoceras lillianense" = Tarrantoceras sellardsi, "Tarrantoceras rotatile" = Tarrantoceras sellardsi, "Tarrantoceras stantoni" = Tarrantoceras sellardsi, Acanthoceras amphibolum, "Euomphaloceras lonsdalei" = Cunningtoniceras lonsdalei
"Tarrantoceras lillianense" = Tarrantoceras sellardsi Adkins 1928 ammonite
n. sp.
"Tarrantoceras rotatile" = Tarrantoceras sellardsi Adkins 1928 ammonite
n. sp.
"Tarrantoceras stantoni" = Tarrantoceras sellardsi Adkins 1928 ammonite
n. sp.
Acanthoceras amphibolum Morrow 1935 ammonite
"considerable numbers"
"Euomphaloceras lonsdalei" = Cunningtoniceras lonsdalei Adkins 1928 ammonite
 Ammonitida - Binneyitidae
Borissiakoceras orbiculatum
Borissiakoceras orbiculatum Stephenson 1955 ammonite
n. sp.
Scaphopoda
 Gadilida - Gadilidae
Cadulus sp.
Cadulus sp. Philippi 1844 tusk shell
Gastropoda
 Pseudomelanoidea - Pseudomelaniidae
? Pseudomelania basicostata
? Pseudomelania basicostata snail
n. sp. - originally entered as "? Pseudomelania basicostata"
 Sorbeoconcha - Aporrhaidae
Lispodesthes lirata
Lispodesthes lirata snail
n. sp., "considerable numbers"
 Opisthobranchia - Cylichnidae
? Cylichna sp.
? Cylichna sp. Lovén 1846 snail
mostly internal molds w/soft calc. material - originally entered as "? Cylichna sp."