The Green River Formation.
View opens looking north from Rt89, where you see a mountain formed of whiteish-tan rock known as the Green River formation. Huge ancient lakes once existed in this region, which over the years collected layers of mud and very fine volcanic ash lake sediments. These sediments were the absolute best for preserving fossils of the lake creatures. These fantastic fossils are now on display at the Fossil Butte Monument, just north of these cliffs. They are well worth a visit!!. Fossil Butte National Monument, about 15 miles West of Kemmerer, WY.
The traveler becomes first aware of the whiteish-tan rock layers, soon after leaving Idaho and entering Southwest Wyoming on Rt89 at Sage, WY. The formation is noticeable for the next 80 miles to Rock Springs. It is most noticeable along both sides of the Green River, from which this formations naturally gets its' name. The Green River, a major river of the area, runs south into northeastern corner of Utah and eventually emptying into the Pacific Ocean by way of the Colorado River, Grand Canyon, and the Gulf of California a large "bay" off the north-western coast of Mexico. ************************************ (Photo = 125-2523 ...... ZMM Page = None ...... WayPt = ~115 ~6400ft)