East bank of St. Mary River, south of Lethbridge (Cretaceous of Canada)

Also known as Welling

Where: Alberta, Canada (49.7° N, 112.8° W: paleocoordinates 57.4° N, 78.2° W)

• coordinate based on nearby landmark

When: Bearpaw Shale Formation, Late/Upper Campanian (83.5 - 70.6 Ma)

• 15 m above the base of the Formation; likely that the age of the two mosasaurs is no younger than 74 Ma

• bed-level stratigraphic resolution

Environment/lithology: marine; lithology not reported

Size class: macrofossils

Reposited in the TMP

Primary reference: T. Konishi, D. Brinkman, J. A. Massare and M. W. Caldwell. 2011. New exceptional specimens of Prognathodon overtoni (Squamata, Mosasauridae) from the upper Campanian of Alberta, Canada, and the systematics and ecology of the genus. Journal of Vertebrate Paleontology 31(5):1026-1046 [P. Mannion/P. Mannion/P. Mannion]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 119088: authorized by Philip Mannion, entered by Philip Mannion on 20.10.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Malacostraca
 Decapoda - Nephropidae
Nephropidae indet. Dana 1852 clawed lobster
a lobster claw was also found near the left 10th dorsal rib of the mosasaur
Cephalopoda
  -
Cephalopoda indet. Cuvier 1797
putative cephalopod jaw fragment
Chondrichthyes
 Galeomorphi -
Lamniformes indet. Berg 1958 mackerel shark
TMP 2008.036.0003,
 Lamniformes - Anacoracidae
Squalicorax sp. Whitley 1939 crow shark
4 teeth, including TMP 2008.036.004 and 2008.036.005
Gnathostomata
  -
Osteichthyes indet. bony fish
centrum (gut contents of Prognathodon overtoni)
Actinopteri
 Elopiformes - Elopidae
Elopidae indet. Bonaparte 1846
two centra (gut contents of Prognathodon overtoni)
 Teleostei -
Aulopiformes indet. Rosen 1973
TMP 2008.036.0006
Reptilia
 Testudines -
Nichollsemys baieri Brinkman et al. 2006 sea turtle
jugal, a postorbital, a quadrate, and a supraoccipital (gut contents of Prognathodon overtoni)
 Squamata - Mosasauridae
Mosasaurus missouriensis Harlan 1834 mosasaur
TMP 2008.036.0001 and TMP 2003.400.0001
Prognathodon overtoni Williston 1897 mosasaur
TMP 2007.034.0001 (complete skull and largely articulated postcranium lacking paddles)