siltstone - teaching student specimens of tan siltstone from the Round Mountain unit of the Temblor Formation - UNIT OF 5 SPECIMENS
The Round Mountain Silt is famous for the now-national-landmark Sharktooth Hill fossil collecting locality. Siltstone fits between shale and sandstone in a classification of sedimentary rocks by grain size. Siltstones have a range of grain sizes as well, with this one being close to the finer-grained end of the siltstone spectrum. Compare it with the larger-grained siltstone from the Ridge Basin Group that we offer.
The farther a sediment is transported, the smaller and rounder its grains become. Finer grained sediments take longer to settle out of the water column and are deposited farther from a shoreline in deeper water. This siltstone is marine and some specimens are fossiliferous with small clams. Their delicate shells confirm that this is a deep water sediment, as the shells are too fragile to withstand the high energy near-shore environment.
These siltstone was collected from outcrops along the south edge of the floodplain of the Kern River in Kern County, California. They will withstand student examination without crumbling.
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Some of these specimens are fossiliferous, giving you the opportunity to ask your students, “Igneous, sedimentary or metamorphic, and why do you say so?” We would be happy to pick out specimens that have a small clam - just let us know.
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