conglomerate - display specimen of conglomeratic limestone from the Brian Head Formation
The Brian Head Formation is Late Eocene to Oligocene in age. Conglomerate is not widespread in this formation, and represents stream channel deposits in a non-marine wetlands environment, possibly where a stream discharged into a marshy pond or lake environment that was favorable to calcium carbonate accumulation.
The pebbles (clasts) in this conglomeratic limestone, range from rounded to angular, with the more rounded clasts having traveled farther from their source area than the angular ones. Clast, from the Greek klastos for broken, refers to the rock fragments that make up any sedimentary rock. The finest sedimentary clasts form mudstone, shale and clay. The coarsest clasts form conglomerate.
The contrast between the spectacular variety of clasts and the white calcium carbonate matrix in this conglomerate makes it attractive and unusual. It was collected in the Sevier River valley south of Hatch, Garfield County, Utah.
The specimen with one coin is cut flat on both sides. The specimen with two coins is 1 3/4" thick, natural on one side, cut on the other. Both sides are shown. The pencil is 5" long, for scale.
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