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What is keystone vugs in sedimentary rocks?

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What is keystone vugs in sedimentary rocks?

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  1. Keystones vugs are similar to irregular fenestrae in size and shape but appear in more grainy rock.  They are common in beach sediment and are formed by the trapping of sand.

    (Fenestrae are cavity structures, usually filled with sparite, commonly occuring in peloidal limestones nd dolomites.)

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