Hell Creek Formation?

Question

Where can I find maps of the Hell Creek Formation. Especially where it crosses into Montana

PREFERABLY ONLINE!

Answer 1

Montana State University in Bozeman does a significant amount of research on the Hell Creek Formation through the Museum of the Rockies, and Dr. Jack Horner's work. Makoshika State Park also encompasses portions of the Glendive area of the formation. The state geologic map shows the surface area, and looking in the southeast corner of the map you'll see the intrusion stretching up from the South Dakota border through to Glendive, as well as the areas south of Miles City. Hope that helps.