The Great Salt Lake is all that remains of Lake Bonneville whose depths reached over 1000 feet, and Lake Lahontan which persists as Pyramid Lake today. Glacial ice restricted to tops of mountain ranges and canyon bottoms leaving numerous nunataks. Many animals went extinct in the area at the start of the Holocene. Rim of Canyonlands overlooking the Colorado River 2. Area drained by Green and Colorado rivers.
Grazing can still be a problem.
Mining continues as a problem .