sandstone - yellow-brown medium-grained non-marine Miocene sandstone - Unit of 5 student specimens

This sandstone is Miocene in age, is moderately lithified, and is a member of the Ridge Route Formation  The Ridge Basin is characterized by a variety of depositional environments. A closed or semi-closed basin during the Miocene and Pliocene, it exhibits shallow fresh-water lacustrine deposits such as lagoonal and shoreline deposits and bar complexes, as well as deep fresh-water turbidites and various types of sediment gravity flows. This sandstone was deposited in a delta or deltaic plain.

The sand grains in these specimens are medium-grained and when rubbed off onto a sheet of paper, will look like sand to a student. It would be instructive to compare this sandstone with one is larger grained, with one that is cemented with calcium carbonate, and with different colored sandstones, as sandstone has great variety and a student should not see only one example.

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