Where: Clark County, Arkansas (34.0° N, 93.3° W: paleocoordinates 38.0° N, 65.0° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Marlbrook Marl Formation, Late/Upper Campanian (83.5 - 70.6 Ma)

• Upper Marlbrook Marl Formation

• bed-level stratigraphic resolution

Environment/lithology: marine; gray, blue, calcareous marl

Size class: macrofossils

Collected by K. J. Irwin and G. Phillips in 2012

Collection methods: surface (float),

Primary reference: A. Bell, K. J. Irwin, and L. C. Davis. 2015. Hesperornithiform birds from the Late Cretaceous (Campanian) of Arkansas, USA. Transactions of the Kansas Academy of Science 118(3-4):219-229 [P. Mannion/P. Mannion]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 193918: authorized by Philip Mannion, entered by Philip Mannion on 07.06.2018

Creative Commons license: CC BY (attribution)