conglomerate - hand/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.

This conglomerate will definitely withstand student examination. The contrast between the clasts and the white calcium carbonate matrix makes this attractive and unusual. It  was collected in the Sevier River valley south of Hatch, Garfield County, Utah.

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