USGS 14582. left bank of Walnut Creek, 4.75 miles ENE of Mansfield (Cretaceous of the United States)

Where: Tarrant County, Texas (32.6° N, 97.1° W: paleocoordinates 31.0° N, 61.9° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

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

• probably weathered out of either layer 4 or layer 5

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, silty, 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.
• Bed 5. Clay, dark, shaly, gypsiferous; a few concretionary calcareous sandstone masses about 4 feet above base. Bed 4: Sandstone, thin, platy, and interbedded shale; here and there a small to large, more or less ovate, concretionary (septarian) mass of fine calcareous sandstone reaching 1 foot in thickness, and showing effects of crushing by pressure from above; fossiliferous

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 231936: authorized by Pete Wagner, entered by Pete Wagner on 05.10.2023

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
Cephalopoda
 Ammonitida - Acanthoceratidae
"Euomphaloceras alvaradoense" = Acanthoceras amphibolum
"Euomphaloceras alvaradoense" = Acanthoceras amphibolum Morrow 1935 ammonite