USGS 25504 (Cretaceous of the United States)

Also known as Roadcuts on Mississippi Route 30, 4.9 miles NE of junction of Mississippi Routes 10 and 15, Union Co., Miss.

Where: Union County, Mississippi (34.5° N, 89.0° W: paleocoordinates 38.2° N, 65.8° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Keownville Member (Ripley Formation), Maastrichtian (72.1 - 66.0 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: marine; sandy limestone

• limestone, tan, weathered, sandy, fossiliferous

Size class: mesofossils

Reposited in the USGS

• USGS 25504: N.F. Wohl and L.W. Stephenson 1955

Primary reference: N. F. Sohl. 1960. Archeogastropoda, Mesogastropoda and stratigraphy of the Ripley, Owl Creek, and Prairie Bluff Formations. US Geological Survey Professional Paper 331:1-151 [M. Kosnik/M. Kosnik]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 7603: authorized by Matt Kosnik, entered by Matt Kosnik on 18.07.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

Echinoidea
 Cassiduloida -
Hardouinia mortonis Michelin 1850 sea urchin
Hardouinea mortonis (Michelin)
Bivalvia
 Trigoniida - Megatrigonioidae
Pterotrigonia angulicostata clam
Trigonia angulicostata (Gabb)