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Pennyroyal Plateau: Map

  
  

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Regions of Kentucky, with the Pennyroyal plateau shown in light brown
The Pennyroyal Plateau, or, as it is more commonly called in Kentuckymarker, the Pennyrile, is a large area of the state that features rolling hills, caves, and karst topography in general.

The Pennyrile is bordered by the Pottsville Escarpment in the east. The Pottsville Escarpment is the transition zone from the central part of Kentucky to the higher and geologically younger Cumberland Plateau in the eastern part of the state. North of the Pennyrile, the Bluegrassmarker borders the Chester Escarpment. This escarpment, mostly based on weathering-resistant sandstone, is a fairly dramatic one, featuring many cliffs, canyons, waterfalls and rock shelters.

The Pennyrile is bordered on the north by Muldraugh Hill, the geological escarpment that forms the transition from the geologically older Bluegrass to the Pennyrile. This is a series of knobs and ridges based on hard siltstones.

The Pennyrile is bordered on the west by the younger Jackson Purchasemarker, a mostly alluvial area. The Pennyrile is usually thought to include the Western Coal Fields of Kentucky, located in the northwestern area of the state, and separated from the rest of the Pennyrile by the Dripping Springs Escarpment, also based on sandstone.

To the south, the Pennyrile continues as the Highland Rim of Middle Tennessee.

The Pennyrile is largely in farmland where the bedrock is limestone, and most of the Pennyrile is based on limestone, particularly the St. Louis Limestone or Ste. Genevieve Limestone. In some areas, the limestone is capped with a soft sandstone. This kind of formation—sandstone over limestone—is featured in the Mammoth Cavemarker area, and has enabled the formation of the world's most extensive cave system. Numerous other caves exist in the Pennyrile, where some of the most intensely cave-forming limestones of the world are to be found.

Where the capping sandstone is intact, the land surface is usually forested, rugged hills.


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