History
About 450 million years ago sedimentary rocks were deposited as the land was covered intermittently by shallow seas that ingressed and regressed. Over the eons the alternating deposits of mud and oceanic debris were compressed to form limestone, shale and sandstone layers. Today, these layers are 1,300 feet (400 m) above sea level. Within the last 500,000-one million years, flood waters dissolved along fractures in the limestone bedrock to create most of the cave. Acidic rainwater also sculpted the land above and around the cave, creating thousands of sinkholes and other karst features in the county where the cave is located.
Read more about this topic: Forestville Mystery Cave State Park
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—Attributed to Georges Clemenceau (1841–1929)