Monocacy River Cave, Frederick County
Monocacy River Cave is developed in thinly-bedded Frederick Limestone.
This small cave is 20 feet above the east bank of the Monocacy River, east of Hansonville (just above the power line). The entrance is 4 feet wide and 2 feet high, at the base of a small cliff. The cave extends for 25 feet to the southeast as a crawlway and continues as a 10-inch tube. The floor is composed of river alluvium.