USGS Mesozoic D10898, Chispa Summit (Cretaceous of the United States)

Where: Jeff Davis County, Texas (30.7° N, 104.8° W: paleocoordinates 30.9° N, 69.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Neocardioceras juddii ammonoid zone, Chispa Summit Formation, Late/Upper Cenomanian (99.6 - 93.5 Ma)

• About 40 m (131 ft) above base

• bed-level stratigraphic resolution

Environment/lithology: marine; poorly lithified, yellow marl

• Yellowish, soft marl bed

Size class: macrofossils

Collected by S.C. Hook, W.A. Cobban in 1979; reposited in the USNM

Primary reference: W. A. Cobban. 1988. Tarrantoceras Stephenson and related ammonoid genera from Cenomanian (Upper Cretaceous) rocks in Texas and the western interior of the United States. United States Geological Survey Professional Paper 1473:1-30 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 177107: authorized by Matthew Clapham, entered by Matthew Clapham on 19.03.2016

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ammonitida - Vascoceratidae
Vascoceras silvanense, Vascoceras cf. cauvini
Vascoceras silvanense Choffat 1898 ammonite
Vascoceras cf. cauvini Chudeau 1909 ammonite
 Ammonitida - Acanthoceratidae
Neocardioceras juddii, Thomelites sp., Kamerunoceras cf. eschii, Pseudaspidoceras sp.
Neocardioceras juddii Barrois and Guerne 1898 ammonite
Thomelites sp. Juignet et al. 1973 ammonite
Kamerunoceras cf. eschii Solger 1904 ammonite
Pseudaspidoceras sp. Hyatt 1903 ammonite