Laccoliths, Dikes, and Bears - Oh my!

I recently explored several plutonic formations associated with an ancient volcanic field in central Montana. The volcano(es), which was active during the late Cretaceous period, left its mark on the landscape in the form of several laccoliths, dikes, and sills. Centuries ago the sill shown in the photo below was used as a buffalo jump by Montana's first people. That is my shadow on the cliff. CLICK HERE to learn more about the trip and access the photo tour, which includes some nice shots of the bear that inspired me to climb a tree.