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DENMAN ISLAND CONCRETION
Northumberland Fm, Upper Cretaceous Nanaimo Group A concretion found eroding out of the grey shales at Denman Island. Thee Upper Cretaceous Nanaimo Group of southwest British Columbia is a >4 km-thick succession consisting mostly of deep marine siliciclastics deposited directly on the Insular Superterrane. As such, this succession has been the focus of several paleomagnetic, isotope