sandstone - teaching hand specimen of a Miocene fine grained yellow brown sandstone from the Ridge Basin of California
This sandstone is Miocene in age, is moderately lithified, was deposited in a closed basin in a non-marine or brackish marine depositional environment. It is mapped as the Ridge Route Formation, part of the Ridge Basin Group. The orange shade is a result of terrestrial deposition and subaerial oxidation. The tan specimen was deposited in a brackish marine environment and buried without being oxidized.
These specimens are fine grained and when rubbed off onto a sheet of paper, the grains 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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