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37 A Royal Gorge
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Posted By: Hal Brown
Date Posted: Oct 12, 2008
Description: An example of layer cake geology heading out of the mountains? Not even. The formations are tilted at a huge angle away from the core of the Rockies.

Shale and sandstones compete in regular intervals with coal. This indicates regular fluctuation in the depositional environments. It is typical worldwide of sequences from the Pennsylvanian age.

According to geology texts, three hundred million years ago (during Pennsylvanian time) southern Colorado was a shallow sea. Some of the sea sediments got pushed up by the ancestral Rocky Mountains forming two big islands. These first mountains eroded away.

As the plates started shifting around and California joined the U.S. mainland, uplift occurred far inland. Normally mountain building occurs within 200 to 400 miles of where oceanic crust gets shoved under the continental crust. The Rockies are a strange exception.

During the Laramide orogeny (a mere 70 million years ago), the Rockies started rising far inland. Some geologists think it was because the oceanic crust didn’t get pushed down as rapidly as typically happens. The dragging and bumping of the shallow ocean crust might just have knocked up the broad and high Rockies. Strange indeed.
Date Taken: Oct 12, 2008
Place Taken: Near Coaldale, CO
Owner: Dan Nickens
File Name: 36_Rocky_Layer_Cake.jpg   - Photo HTML
Full size     - <img src="/show.php?splash=SZT4E0000h">
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Thumbnail - <img src="/show.php?splash=SZT4E0000s">
Category: 329, Taking Peli Home
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