Hikers explore Rocky Hollow Canyon in Turkey Run State Park, in historic Parke County, Indiana, USA. Rocky Hollow Falls Canyon Nature Preserve.

Hikers explore Rocky Hollow Canyon in Turkey Run State Park, in historic Parke County, Indiana, USA. Rocky Hollow Falls Canyon Nature Preserve is a National Park Service Registered Natural Landmark. The Mansfield sandstone bedrock was formed during the Carboniferous Period when sand layers at the mouth of ancient Michigan River was compacted and cemented into solid rock. Ancient swamps became coal seams which were mined in the late 1800s and early 1900s. Glacial meltwater erosion in the Pleistocene Epoch (less than 20,000 years ago) carved today's canyons and potholes.

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Contained in galleries: IN: Parke County: Turkey Run State Park

Hikers explore Rocky Hollow Canyon in Turkey Run State Park, in historic Parke County, Indiana, USA. Rocky Hollow Falls Canyon Nature Preserve is a National Park Service Registered Natural Landmark. The Mansfield sandstone bedrock was formed during the Carboniferous Period when sand layers at the mouth of ancient Michigan River was compacted and cemented into solid rock. Ancient swamps became coal seams which were mined in the late 1800s and early 1900s. Glacial meltwater erosion in the Pleistocene Epoch (less than 20,000 years ago) carved today's canyons and potholes.