North View From Rt89, Showing the Fossil Butte Monument Landscape. Huge Ancient Lakes Existed In This Region, and Left Behind Lake Sediment Fossils That Turned Into the Whiteish Tan Rock Seen In This Mountain. The layers Are known as the Green River Formation, Which Is Composed of Mud and Picture missing Volcanic Ash.
Fossil Butte National Monument, about 15 miles West of Kemmerer, WY. Well worth a visit!!. The traveler becomes first aware of this 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 it's 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.
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(Photo = 125-2523 ...... ZMM Page = None ...... WayPt = ~115 ~6400ft)