These are foothills of the Sierras, just west of Bishop.


Notice how they appear as though they were simply sediment, boulders, and rocks dumped into huge heaps? That;s EXACTLY what they are!

These hills are a "Glacial Moraine" --- basically, all the stuff the glaciers rip out of mountains, hills, and the ground, and carry great distances in their ice. When the glaciers thaw (mostly in a certain area), the matter that was mixed into the ice piles-up, forming a Moraine.

Even to this day, in the MUCH warmer Cenozoic Era, there are still glaciers in the Sierras.