Also known as Alzadasaurus riggsi type locality

Where: Montana (45.0° N, 104.4° W: paleocoordinates 44.5° N, 64.3° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Belle Fourche Formation (Colorado Group), Late/Upper Cenomanian (99.6 - 93.5 Ma)

• formation-level stratigraphic resolution

Environment/lithology: marine; lithology not reported

Size class: macrofossils

Reposited in the FMNH

Primary reference: S. P. Welles. 1943. Elasmosaurid plesiosaurs with description of new material from California and Colorado. Memoirs of the University of California 13:125-254 [R. Benson/R. Benson]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 76731: authorized by Matthew Carrano, entered by Matthew Carrano on 30.11.2007, edited by Roger Benson

Creative Commons license: CC BY (attribution)