Where: Fall River County, South Dakota (43.4° N, 103.3° W: paleocoordinates 47.1° N, 67.9° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Niobrara Formation, Late/Upper Santonian (85.8 - 83.5 Ma)

• uppermost Niobrara Formation, a meter below the Niobrara-Pierre Shale contact

• bed-level stratigraphic resolution

Environment/lithology: marine; bentonitic, yellow chalk

Size class: macrofossils

Collected in 1990; reposited in the SDSM

Primary reference: B. A. Schumacher and J. E. Martin. 2016. Polycotylus latipinnis Cope (Plesiosauria, Polycotylidae), a nearly complete skeleton from the Niobrara Formation (Early Campanian) of southwestern South Dakota. Journal of Vertebrate Paleontology 36(1):e1031341:1-15 [P. Mannion/P. Mannion]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 194130: authorized by Philip Mannion, entered by Philip Mannion on 14.06.2018

Creative Commons license: CC BY (attribution)