Where: Ellis County, Texas (32.5° N, 97.1° W: paleocoordinates 30.9° N, 61.9° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Britton Formation, Late/Upper Cenomanian (99.6 - 93.5 Ma)

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified lithology not reported

Size class: macrofossils

Collected by J.H. Renfro, R.F. Renfro; reposited in the USNM

Primary reference: W. A. Cobban. 1987. The Upper Cretaceous (Cenomanian) ammonites Metengonoceras dumbli (Cragin) and M. acutum Hyatt. United States Geological Survey Bulletin 1690:C1-C7 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 175718: authorized by Matthew Clapham, entered by Matthew Clapham on 03.01.2016

Creative Commons license: CC BY (attribution)