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 field photo shows interbedded sandstone, shale and siltstone in an outcrop of the Ridge Route formation. Notice the sandstone is resistant to weathering and forms a prominent ledge. In arid areas, sandstones are cliff-formers. Below the yellow brown sandstone the shale forms a slope, with gray siltstone forming a number of small ledges below. 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 instructiv