The crinoid Marsupites in the Upper Cretaceous Nanaimo Group, British Columbia: Resolution of the Santonian–Campanian boundary in the North Pacific Province

The strongly endemic nature of Late Cretaceous molluscan faunas of the North Pacific region creates challenges for correlation of stratigraphic sections in basins surrounding the proto-Pacific Ocean with European standard successions. A particularly problematic stage boundary in the Pacific region is the Santonian–Campanian boundary, which is poorly defined in the northwest and northeast Pacific regions on the basis of local ammonite and...