Where: Utah (37.1° N, 111.7° W: paleocoordinates 40.6° N, 77.3° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Pseudoaspidoceras flexuosum ammonoid zone, Tropic Shale Formation, Early/Lower Turonian (93.5 - 89.3 Ma)

• Tropic Shale, approximately 18 m above local top of Dakota Formation; approximately 12.3 m above top of Bentonite B; 1.7 m below top of Bentonite C (Fig. 2, column 1); middle to upper part of the Pseudoaspidoceras flexuosum Ammonoid Biozone.

• bed-level stratigraphic resolution

Environment/lithology: marine; shale

Size class: macrofossils

Collected in 2000-2001

Collection methods: quarrying, surface (float), surface (in situ), mechanical,

• MNA, Museum of Northern Arizona, Flagstaff, Arizona, USA

Primary reference: L. B. Albright, D. D. Gillette, and A. L. Titus. 2007. Plesiosaurs from the Upper Cretaceous (Cenomanian-Turonian) Tropic Shale of southern Utah, part 2: Polycotylidae. Journal of Vertebrate Paleontology 27(1):41-58 [M. Carrano/H. Street]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 150870: authorized by Roger Benson, entered by Roger Benson on 16.09.2013

Creative Commons license: CC BY (attribution)