Where: British Columbia, Canada (49.0° N, 124.0° W: paleocoordinates 52.7° N, 90.0° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Sphenoceramus schmidti inoceramid zone, Haslam Formation, Late/Upper Santonian (85.8 - 83.5 Ma)

• Unfortunately, few associated taxa are known from these beds, although T. Bullard noted a single in situ thecal plate of Marsupites less than 0.5 m stratigraphically above the youngest specimen of Eubostrychoceras elongatum at the upstream end of this interval of Haslam Creek, in the stratigraphically-lowest beds of the interval. The bivalves Sphenoceramus elegans and S. cf. orientalis are also noted continuously throughout this section, occasionally co-occurring with the crinoids. Thus, the stratigraphic interval exposed along 'Step Creek' can be assigned to the lower, Sphenoceramus elegans Subzone of the S. schmidti Zone, and the beds at along Haslam Creek to the south are likely assignable to this interval as well. The presence of Eubostrychoceras elongatum closely underlying the stratigraphically oldest specimens of Marsupites in the upper Haslam Creek section further supports the interpretation that these intervals along both Haslam Creek and Step Creek represent the lowest part of the Sphenoceramus elegans Subzone of the S. schmidti Zone.

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; lithified siltstone

Size class: macrofossils

Collection methods: Repository: Royal British Columbia Museum

Primary reference: J. W. Haggart and R. Graham. 2018. The crinoid Marsupites in the Upper Cretaceous Nanaimo Group, British Columbia: resolution of the Santonian-Campanian boundary in the North Pacific Province. Cretaceous Research 87:277-295 [M. Clapham/M. Clapham]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 210551: authorized by Matthew Clapham, entered by Matthew Clapham on 03.06.2020

Creative Commons license: CC BY (attribution)