Mississippian Period (ambrotype by Alison Carey)

"The prospect of fossil discovery put an extra spring in his step that day. For some reason, this area is a hot spot for invertebrate fossils -- crinoids, bi-valve seashells, and horn coral in particular. We stopped to rest on a large limestone slab and I scanned the vast desert below, wondering what made this desolate mountainside such a popular final resting place for ancient sea creatures.

"'It's a combination of a few things,' Mark Milligan told me. He explained that to understand why parts of Utah are so fossil-rich, we must look at ancient geology. Rewind past the great Lake Bonneville, past the formation of the mountain ranges and even the age of the dinosaurs to the Mississippian Period -- roughly 350 million years ago -- when "here" technically wasn't here ... yet."

Labels: American West, Transcript Bulletin, Trip Reports