Cave of the Mounds the Interior and the National Park Service. To be considered a NNL, "a site must be one of the best examples of a natural region's characteristic biotic or geologic features." Cave of the Mounds is home to many varieties of speleothems. As with most caves, stalactites and stalagmites are common. Formations found inside the cave include: These formations come in many different brilliant colors such as reds, browns, blues, and grays. The reds and browns are caused by the presence of iron oxide in the formation. Similarly, blues and grays are caused by manganese oxide. Some speleothems are even partially
Petty John's Cave use or trust any ropes or lines left in the cave. Please also help this much abused cave by not damaging formations and packing out trash. The Bridge Room is a good place to take a rest. You can hang your legs over the edge and listen to the stream that is 80 ft below. The Worm Tube leads to the Echo Room, which is the biggest room of the cave. The Volcano Room is shaped like a large funnel and it leads to the stream passage and the sump. The Over-Under Room and the Signature room are also other