Also known as M-21

Where: Arkansas (35.8° N, 92.6° W: paleocoordinates 10.9° S, 32.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Fayetteville Formation, Pendleian (330.9 - 327.0 Ma)

• Lower shale member. Carboniferous, upper Mississippian, Chesterian, Pendleian stage, E1 zone = lower Namurian A

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; lithified, black shale

Size class: macrofossils

Reposited in the AMNH, SUI

• Cephalopods at SUI; shark material at AMNH

Primary reference: R. H. Mapes. 1979. Carboniferous and Permian Bactritoidea (Cephalopoda) in North America. University of Kansas Paleontological Contributions 64:1-75 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 155545: authorized by Matthew Clapham, entered by Matthew Clapham on 16.04.2014

Creative Commons license: CC BY (attribution)