Grosvenor Arch

2016-04-07
P1240311 Grosvenor arch is located at the contact between the Henrieville sandstone (165 million years old) and the Dakota formation (95 million years old). At this...
Grosvenor arch is located at the contact between the Henrieville sandstone (165 million years old) and the Dakota formation (95 million years old). At this…
P1240318 Double arch.
Double arch.
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