USGS 15082, Session Creek (Carboniferous of the United States)

Where: Arkansas (34.8° N, 94.0° W: paleocoordinates 10.4° S, 33.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Gastrioceras branneri ammonoid zone, Johns Valley Formation, Bashkirian (323.2 - 315.2 Ma)

• Gastrioceras branneri subzone.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, ferruginous, nodular shale

Size class: macrofossils

Collected by M. Gordon, R. Kopf, J.A. Reinemund in 1954; reposited in the USNM

Primary reference: M. Gordon. 1964. Carboniferous Cephalopods of Arkansas. United States Geological Survey Professional Paper 460:1-322 [J. Alroy/C. Simpson/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 157955: authorized by Matthew Clapham, entered by Matthew Clapham on 11.07.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

Cephalopoda
 Goniatitida - Glaphyritidae
"Glaphyrites oblatus" = Syngastrioceras oblatum
"Glaphyrites oblatus" = Syngastrioceras oblatum Miller and Moore 1938 ammonite
 Goniatitida - Gastrioceratidae
Gastrioceras (Lissogastrioceras) fittsi Miller and Owen 1944 ammonite
 Prolecanitida - Pronoritidae
"Stenopronorites arkansiensis" = Pseudopronorites arkansiensis
"Stenopronorites arkansiensis" = Pseudopronorites arkansiensis Smith 1896 ammonite
 Pseudorthocerida - Pseudorthoceratidae
"Mooreoceras normale" = Pseudorthoceras knoxense
"Mooreoceras normale" = Pseudorthoceras knoxense McChesney 1859
 Nautilida - Dentoceratidae
Dentoceras belemnitiforme Flower 1964 nautiloid