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Pinhorn Provincial Grazing Reserve (Cretaceous of Canada)

Also known as Wendiceratops type locality, “South Side Ceratopsian” bonebed

Where: Alberta, Canada (49.1° N, 110.9° W: paleocoordinates 56.4° N, 76.4° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Oldman Formation (Belly River Group), Middle Campanian (84.9 - 70.6 Ma)

• The bonebed occurs in the Oldman Formation, 10 m above the top of the Taber coal zone, and just above a sandy interval of the Foremost Formation referred to as the Herronton sandstone zone

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; sandy mudstone

• transitional marginal marine-terrestrial unit deposited during the regressive phase of the Western Interior Seaway
• The bonebed host unit sits at the top of a 10 m thick succession of interbedded 20–50 cm thick mudstones, and thin siltstones and sandstones. The fossils are produced from an approximately 40 cm thick, organic-fragment-rich clayey, sandy mudstone that is rich in coalified root traces, both horizontal and vertical, suggesting a saturated or water-logged anoxic deposit. The bonebed zone is massive with no apparent sedimentary structures or lamination, indicating a mass sediment flow origin or extensive trampling, or both; thus, the elements may be largely in situ, or minimally reworked

Size class: macrofossils

Collected in 2010-; reposited in the ROM

Collection methods: quarrying,

• Six 1 m x 1 m grids were completely excavated, while another 12 grid sections were partially excavated, including at least 6 incomplete grids along the erosional face of the quarry (Fig 2). The average number of elements/grid from the completely excavated grids is 17, with a range of 12 (grid 5D) to 23 (grid 8D). The average length of the mapped elements (excluding bone fragments) is 173 mm (n = 126).

Primary reference: D. C. Evans and M. J. Ryan. 2015. Cranial anatomy of Wendiceratops pinhornensis gen. et sp. nov., a centrosaurine ceratopsid (Dinosauria: Ornithischia) from the Oldman Formation (Campanian), Alberta, Canada, and the evolution of ceratopsid nasal ornamentation. PLoS ONE 10(7):e0130007 [P. Mannion/J. Tennant] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 171408: authorized by Philip Mannion, entered by Jonathan Tennant on 10.07.2015

Creative Commons license: CC BY (attribution)