sandstone - yellow-brown fine to medium grained thin bedded sandstone - teaching hand specimen
Sandstone in the Ridge Route Formation ranges from massive to thinly bedded. The thin bedding in these examples will reinforce "sedimentary" to students, who might be expecting some evidence of bedding.
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 yellowish color is due to terrestrial deposition and subaerial oxidation.
The sand grains in these specimens are fine to 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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