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Thalesian t1_jeaou00 wrote

The opening of the canyon near Shoshone starts of in the Precambrian era nearly a billion years ago. The canyon ends in the Permian 250 million years ago. Nearly every geologic layer in the interim, covering the evolution of animal and plant life, is visible indexed like a library. When you exit the canyon toward Thermopolis, you enter the bright red sandstone and shales of the Triassic, when dinosaurs first began to evolve. Thermopolis itself is covered in the Jurassic and Cretaceous, the peak of dinosaurs. This area is famous for textbook geology.


Mightbeagoat OP t1_jebzuuw wrote

That's awesome. I was looking at all of the different colors and layers of rock as we were driving through and wondering how it all formed. Thanks for the informational comment!