Where: Arkansas (33.7° N, 92.9° W: paleocoordinates 37.7° N, 72.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Maastrichtian to Maastrichtian (72.1 - 56.0 Ma)

• Osteichthyan fossils reported here were recovered from a lag deposit separating the uppermost Arkadelphia Formation and basal Midway Group.

Environment/lithology: marine; lithology not reported

Size class: macrofossils

Reposited in the AMNH

Collection methods: sieve

• Osteichthyan fossils were collected in the field through both sieving and surface-collecting the lag deposit during times of low water flow in the river. Additionally, deeper areas of the river along cut banks and channels were explored by snorkeling and removal of in situ matrix lag specimens by pry bars, sledge hammers, and chisels. Mesh sizes for sieving in the field ranged from 1.0 to 5.0 mm. Approximately 500 kg of sediment was recovered for laboratory sieve analysis. In the lab, sediment was thoroughly washed through progressively finer-meshed screens ranging from 0.5 to 5.0 mm and dried under heat lamps. Teeth were removed using a magnifying glass and imaged directly with an Olympus SZ61 Binocular Microscope attached to an Infinity-2 Digital Camera. Specimens partially enclosed in matrix (referred to as matrix specimens here) were imaged with a Cannon EOS-30D Digital Camera. Because no new genera or species were identified among the specimens we recovered, abbreviated synonymies are utilized. Specimens described here have been deposited in the fossil fish collections of the American Museum of Natural History (AMNH FF), New York

Primary reference: M. A. Becker, C. S. Mallery, and J. A. Chamberlain. 2010. Osteichthyans from an Arkadelphia Formation–Midway Group lag deposit (Late Maastrichtian–Paleocene), Hot Spring County, Arkansas, U.S.A. Journal of Vertebrate Paleontology 30(4):1019-1036 [M. Bell/M. Bell]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 145187: authorized by Mark Bell, entered by Mark Bell on 28.05.2013

Creative Commons license: CC BY (attribution)