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Another formation identification


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Based only on the photo and no other info, I'd say it is a Sandstone with layers of conglomerate.  The holes and raised areas are the result of "differential weathering" caused by differences in harness of the minerals that cement the sand grains & pebbles together.

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I just read that during the Pennsylvanian Period (320-285 million years ago) much of Utah was under an ancient sea which created much of Utah's rock formations we see today. They were showing examples of "tafoni"...a rock formation which looked a lot like your pic...you may want to check it out! 

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