MDM Quarry 18, North Cox pit (Cretaceous of Canada)

Where: Manitoba, Canada (49.3° N, 98.3° W: paleocoordinates 53.7° N, 63.2° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Baculites obtusus ammonoid zone, Pembina Member (Pierre Shale Formation), Early/Lower Campanian (83.5 - 70.6 Ma)

• correlated with Sharon Springs Member in South Dakota and Wyoming by Gill and Cobban (1965) and McNeil and Caldwell (1981)

• bed-level stratigraphic resolution

Environment/lithology: offshore; bentonitic, black, carbonaceous shale

• Pembina was deposited in quiet water well below wave base, probably well removed from contemporary shores, but gypsum damage obscures evidence.
• The lower unit of the Pembina Formation, from which the fossils were collected, is a distinctive series of black, carbonaceous shales interbedded with seams of bentonite.

Size class: macrofossils

Collection methods: quarrying,

Primary reference: E. L. Nicholls. 1988. The first record of the mosasaur Hainosaurus (Reptilia: Lacertilia) from North America. Canadian Journal of Earth Sciences 25:1564-1570 [J. Alroy/E. Leckey/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 23366: authorized by John Alroy, entered by Jill Wertheim on 12.07.2002, edited by Erin Leckey and Hallie Street

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Reptilia
 Squamata - Mosasauridae
"Hainosaurus pembinensis n. sp." = Tylosaurus pembinensis, "Plioplatecarpus nichollsae" = Latoplatecarpus nichollsae1
"Hainosaurus pembinensis n. sp." = Tylosaurus pembinensis Nicholls 1988 mosasaur
incomplee skull and mandible, left humerus, right femur, articulated vertebral column lacking the first two, and possibly the third, cervical vertebrae
"Plioplatecarpus nichollsae" = Latoplatecarpus nichollsae1 Cuthbertson et al. 2007 mosasaur
M 83.10.18, isolated partial skull elements and right humerus
 Testudines -
cf. Chelonioidea indet.2
cf. Chelonioidea indet.2 Baur 1893 sea turtle
Family, genus, species indet.
1Komishi and Caldwell 2009; 2Nicholls et al. 1990