The Geologic Oddity in the Philippines; The Chocolate Hills

The more than 1,700 closely spaced dome shaped hills on the island of Bohol in the Philippines are a strange geologic oddity. They are frequently covered by green grasses, which then wilt away causing the features to turn a brown color during the dry season. Known as the Chocolate Hills, these fascinating mounds are an example of an unusually young type of karst terrain. In tropical areas with heavy rainfall, limestone can be easily eroded to form abundant caves, cliffs, and other peculiar features.

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Sources/Citations:
[1] Salomon, J. N. (2011). A Mysterious Karst: the “Chocolate Hills” of Bohol (Philippines). Acta Carsologica, 40(3). https://doi.org/10.3986/ac.v40i3.3

Thumbnail Photo Credit: Mark Levitin, User Proxodimec, Wikipedia Commons, CC BY SA 4.0-I

0:00 The Chocolate Hills
0:44 Location
1:07 Karst Terrain
1:47 Limestone is Deposited
2:26 Layers of Shale & Uplift
3:24 Future of the Chocolate Hills

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