6 miles northeast of Fayetteville (Carboniferous of the United States)

Where: Arkansas (36.1° N, 94.1° W: paleocoordinates 8.3° S, 32.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Bloyd Shale Formation, Morrowan (318.1 - 314.6 Ma)

• "in the subconglomerate coal measures"

Environment/lithology: terrestrial; lithified siliciclastic sediments

Size class: macrofossils

Preservation: mold/impression

Collected by F.S. Harvey; reposited in the USNM

Primary reference: S. H. Scudder. 1884. A contribution to our knowledge of Paleozoic Arachnida. Proceedings of the American Academy of Arts and Sciences 20:15-22 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 153485: authorized by Matthew Clapham, entered by Matthew Clapham on 22.12.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Arachnida
 Trigonotarbida - Anthracomartidae
Anthracomartus trilobitus n. sp. Scudder 1884
USNM 37982, 37983; 8 specimens at USNM and Scudder (1890) mentions "more than half a dozen" but Wright & Selden say there are 22