Johnson Ranch, Redbird (Cretaceous to of the United States)

Also known as T. bonneri type

Where: Niobrara County, Wyoming (43.4° N, 104.2° W: paleocoordinates 49.5° N, 72.2° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Baculites mclearni and Baculites obtusus ammonoid zone, Sharon Springs Member (Pierre Shale Formation), Early/Lower Campanian to Early/Lower Campanian (83.5 - 70.6 Ma)

• 10 ft above Ardmore Bentonite

•In fact the Sharon Springs Member spans the Baculites mclearni and Baculites obtusus Zones in Wyoming (Gill et al. 1972)

• bed-level stratigraphic resolution

Environment/lithology: marine; lithology not reported

Size class: macrofossils

Primary reference: D. A. Adams. 1997. Trinacromerum bonneri, new species, last and fastest pliosaur of the Western Interior Seaway. Texas Journal of Science 49(3):179-198 [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 77312: authorized by Matthew Carrano, entered by Matthew Carrano on 08.01.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

 Sauropterygia - Polycotylidae
"Trinacromerum bonneri n. sp." = Dolichorhynchops bonneri
"Trinacromerum bonneri n. sp." = Dolichorhynchops bonneri Adams 1997 plesiosaur
KUMNH 40002 (holotype, complete skeleton minus skull)