The Laramie Formation
Laramie Formation - Eroding sand dune - White sandstone returns to sand, at the bottom of the picture. The white gradually turns to pink or brownish-red where it blends with the Fox Hills Formation, on the right.
Laramie Formation - Eroding sand dune - White sandstone returns to sand, at the bottom of the picture. The white gradually turns to pink or brownish-red where it blends with the Fox Hills Formation, on the right.