Where: Big Horn County, Wyoming (44.6° N, 108.1° W: paleocoordinates 39.0° N, 51.5° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Upper Member (Sundance Formation), Oxfordian (163.5 - 157.3 Ma)

• "final transgressive-regressive cycle of the Sundance Seaway"

Environment/lithology: marginal marine; poorly lithified, glauconitic, gray, green shale and poorly lithified, fine-grained sandstone

Size class: macrofossils

• stomach contents with gastroliths and ichthyosaur embryonic elements

Collected by F. R. O'Keefe in 2005; reposited in the USNM

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

Primary reference: F. R. O'Keefe, H. P. Street, J. P. Cavigelli, J. J. Socha, and R. D. O'Keefe. 2009. A plesiosaur containing an ichthyosaur embryo as stomach contents from the Sundance Formation of the Bighorn Basin, Wyoming. Journal of Vertebrate Paleontology 29(4):1306-1310 [M. Carrano/H. Street]more details

Purpose of describing collection: taphonomic analysis

PaleoDB collection 96679: authorized by Matthew Carrano, entered by Hallie Street on 23.06.2010

Creative Commons license: CC BY (attribution)