English: The lower units of the Black Hills Paleozoic layers. The Deadwood Formation, Englewood Formation, and PahaSapa Limestone are topped with a gravel terace of Cenozoic age.
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The lower units of the Black Hills Paleozoic layers. The Deadwood Formation, Englewood Formation, and PahaSapa Limestone are topped with a gravel terace of Cenozoic age.
Photo and Graphics by BHrock aka Mike Vinton
Captions
The lower units of the Black Hills Paleozoic layers.