description Craters of the Moon Caves Complex Overview
The Craters of the Moon Caves Complex is a group of volcanic caves within Craters of the Moon National Monument and Preserve in Idaho. Most are lava tubes formed when the outside of a lava flow cooled while molten rock continued to move beneath it; the park documents more than 700 caves, but entry is controlled by permits and most caves are closed for safety and bat protection.
help Craters of the Moon Caves Complex FAQ
How were the caves at Craters of the Moon formed?
They formed as lava tubes during eruptions along Idaho's Great Rift volcanic zone. The outer surface of a lava flow cooled into a crust while hotter lava continued moving underneath, leaving a tunnel when the flow drained.
Where is the Craters of the Moon Caves Complex?
The complex is in southern Idaho, near the town of Arco, within Craters of the Moon National Monument and Preserve. The caves are part of the landscape created by the area's most recent eruptive period.
Are the Craters of the Moon caves limestone caves?
No, they are basaltic lava tubes created by volcanic flows. Their dark volcanic rock, collapsed skylights, and rough surfaces differ from the mineral formations normally associated with limestone caves.
Which accessible cave is commonly associated with the Caves Trail?
Indian Tunnel is one of the named caves reached from the Caves Trail at Craters of the Moon. The trail also connects visitors with other lava-tube features formed by the Great Rift eruptions.
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