Where: Arkansas (35.8° N, 91.9° W: paleocoordinates 11.2° S, 31.9° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Eumorphoceras bisulcatum ammonoid zone, Pitkin Formation, Arnsbergian (327.0 - 323.7 Ma)
• Pitkin limestone, upper shale member.
• group of beds-level stratigraphic resolution
Environment/lithology: marine; lithified shale
Size class: macrofossils
Collected by M. Gordon, R. Kopf 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 157941: authorized by Matthew Clapham, entered by Matthew Clapham on 11.07.2014
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
Pseudorthoceras stonense Gordon 1964
Mitorthoceras crebriliratum Girty 1909 | |
Reticycloceras croneisi Gordon 1960
Euloxoceras angustius Gordon 1964 | |
Mariceras "sp. B" Ruzhentsev and Shimanskiy 1954 nautiloid | |
"Cravenoceras involutum" = Stenoglaphyrites involutus
"Cravenoceras involutum" = Stenoglaphyrites involutus Gordon 1964 ammonite | |
Rayonnoceras protentum Gordon 1964 | |
Michelinoceras wapanuckense Girty 1909 |