This formation was deposited during the Cambrian Period, when life was evolving rapidly. These rocks formed during the Precambrian Period. Evidence of life during this time is scarce. Driving Tour Stops Please use your odometer to measure mileage between stops. Once outside, follow the trail 225 yards to the cave's natural entrance.
Limestone is a sedimentary rock deposited in oceans.
It is mainly composed of calcium carbonate. Pahasapa Limestone is gray to light tan and forms steep slopes or cliffs. Notice that the cave's natural entrance formed in a ravine. From the visitor center, drive 3.6 miles to this stop. Exit the south end of the visitor center parking lots, turn right onto route 385 South.