Yellowstone Cave

This small cave is really more closely related to a grotto, since it never achieves complete blackness and is not more than 50 ft. long. It really only goes back 15 ft. or so and is covered in guano and rat droppings and nests. This has to be one of the filthiest caves I have ever been into.

The entrance is an easy scramble to get inside.
Looking back downhill from inside.

Spencer in the guano covered cave.

Spencer looking at some guano covered quartz crystals.