Chapman Ranch, north of Ardmore (Ordovician of the United States)

Where: Carter County, Oaklahoma (34.2° N, 97.2° W: paleocoordinates 20.3° S, 86.6° W)

When: Symphysurina bulbosa zone, Chapman Ranch Member (McKenzie Hill Formation), Gasconadian (485.4 - 477.7 Ma)

• a Gasconade horizon (about 35 feet above graptolite beds) in the Arbuckle limestone. PJW: The appropriate Arbuckle rock unit is the Chapman Ranch.

• member-level stratigraphic resolution

Environment/lithology: marine; limestone

Size classes: macrofossils, mesofossils

Primary reference: E. O. Ulrich, A. F. Foerste, and A.K. Miller. 1943. Ozarkian and Canadian cephalopods. Part II, Brevicones. Geological Society of America Special Papers 49:1-240 [P. Wagner/P. Wagner/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 189354: authorized by Björn Kröger, entered by Björn Kröger on 13.10.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Ellesmerocerida - Ellesmeroceratidae
Levisoceras obliquatum Ulrich et al. 1943
Conocerina beani Ulrich et al. 1943