Wallace Ranch (Cretaceous to of the United States)

Also known as T. bonneri paratype

Where: Fall River County, South Dakota (43.0° N, 103.3° W: paleocoordinates 48.9° N, 71.5° W)

• coordinate stated in text

• local area-level geographic resolution

When: Baculites sp. (smooth) - Baculite perplexus ammonoid zone, Sharon Springs Member (Pierre Shale Formation), Early/Lower Campanian to Early/Lower Campanian (83.5 - 70.6 Ma)

• 10 ft below Ardmore Bentonite

•The Sharon Springs Member spans Baculites sp. (smooth) - Baculite perplexus in South Dakota

• formation-level stratigraphic resolution

Environment/lithology: marine; lithology not reported

Size class: macrofossils

Collected by Univ. Nebraska in 1966; reposited in the UNSM

Primary reference: L. D. Martin and J. T. Tate, Jr. 1967. A Hesperornis from the Pierre Shale. Proceedings of the 79th Annual Meeting, Nebraska Academy of Sciences 40 [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 77316: authorized by Matthew Carrano, entered by Matthew Carrano on 08.01.2008, edited by Roger Benson

Creative Commons license: CC BY (attribution)

Taxonomic list

Aves
 Hesperornithiformes - Hesperornithidae
Hesperornis cf. regalis Marsh 1872 bird
"slightly smaller...but agrees with that species in most other respects"
Reptilia
 Sauropterygia - Polycotylidae
Polycotylidae indet.2 Williston 1908 plesiosaur
UNSM 55810 (juvenile skeleton; reported as UNSM 44810 by Adams [1997])
Dolichorhynchops osborni2 Williston 1902 plesiosaur
UNSM 50133 (skull; reported as USNM 50144 by Adams [1997])
"Trinacromerum bonneri" = Dolichorhynchops bonneri1 Adams 1997 plesiosaur
KUMNH 40001 (holotype: skull, lower jaws, first three cervical vertebrae (articulated), pubes and ischia, left humerus and femur, vertebrae and ribs);