Under yellow fall tree leaves, stairs descend Historic Entrance of Mammoth Cave National Park, Kentucky, USA

A couple climbs stairs of the Historic Entrance to Mammoth Cave which drips with water. Mammoth Cave National Park was established in 1941 in Edmonson County, Kentucky, USA and was declared a UNESCO World Heritage Site in 1981 and international Biosphere Reserve 1990. With over 390 miles (630 km) of passageways, the Mammoth-Flint Ridge Cave System is the longest known in the world. Mammoth Cave developed in thick Mississippian-aged limestone strata capped by a layer of Big Clifty Sandstone. Descending limestone layers include the Girkin Formation, Saint Genevieve Limestone, and Saint Louis Limestone.

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Filename: 10MAM-090.jpg
Copyright: © Tom Dempsey / Photoseek.com
Image Size: 3321x5000 / 4.2MB; http://www.photoseek.com/; cave history
Contained in galleries: USA: Kentucky: Mammoth Cave

A couple climbs stairs of the Historic Entrance to Mammoth Cave which drips with water. Mammoth Cave National Park was established in 1941 in Edmonson County, Kentucky, USA and was declared a UNESCO World Heritage Site in 1981 and international Biosphere Reserve 1990. With over 390 miles (630 km) of passageways, the Mammoth-Flint Ridge Cave System is the longest known in the world. Mammoth Cave developed in thick Mississippian-aged limestone strata capped by a layer of Big Clifty Sandstone. Descending limestone layers include the Girkin Formation, Saint Genevieve Limestone, and Saint Louis Limestone.