K. Nielsen

Turonian to Santonian paleoenvironmental changes in the Cretaceous Western Interior Sea: The Carlile and Niobrara formations in southern Alberta and southwestern Saskatchewan, Canada

D. Leckie, J. Haggart, C. Schröder-Adams, 2008 .

A New Stratigraphic Framework for the Upper Colorado Group (Cretaceous) in southern Alberta and southwestern Saskatchewan, Canada

D. Leckie, C. Schröder-Adams, K. Nielsen, 2003 .