Tuesday, December 27, 2011

It was a sedimental journey...

in Culvert Canyon yesterday, where sedimentary structures galore presented themselves in the Kayenta and Navajo Formations (click images to enlarge).  At the base of the landmark sandstone spire lies a channel-fill consisting of an intraformational conglomerate:
Here's the context view of the entire spire:
Nearby, mudcracks were exposed as sole marks on the underside of a bedding plane:
And here's a fallen and rotated slab showing them as they are normally seen on the top surface of a bedding plane (that's my knee at the bottom of the image):
Lastly, at the base of Gold Bar Arch, there are multiple bioturbated beds, separated by laminated sandstones (perhaps tempestites?):

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