Sedimentary rocks form from the deposition and lithification of rock grains that have been eroded or transported. The size and shape of the grains can be used to identify what kind of environment would have formed a particular rock.

This kit contains 12 numbered specimens and a specimen key. Samples contained include bituminous coal, breccia, conglomerate, dolostone, rock gypsum, gray and fossiliferous limestone, red and white sandstone, argillaceous and carbonaceous shale, and siltstone