Sheridan Cave is a Paleo-Indian archaeological site from the late Ice age in Wyandot County, Ohio. Glacial deposits sealed off the cave more than 10,000 years ago. Sheriden Cave is a karst sinkhole on a dolomite ridge that crosses Hancock and Wyandot Counties. It is associated with the Indian Trail Caverns that opened in 1927. Sheriden Cave was discovered in 1989. The cave is unique because in addition to stone tools, there were also bone tools, remains of extinct animals, and organic matter found in the cave. Radiocarbon dating of artifacts indicate that they were used 11,000 and 12,000 years ago.