siltstone - tan siltstone from the Temblor Fm - UNIT OF 5 STUDENT SPECIMENS

Description

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Siltstone - Round Mountain Silt member of the Temblor Formation - Middle Miocene -
Unit of 5 student 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 these shells
are too fragile to withstand the high energy near-shore environment.
These specimens were 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.
We really don't like the tiny finger nail-sized specimens offered to students, as we feel these are too small to see rock textures and too small for examining the identifying characteristics of a mineral. We want the "Oh, Wow!" effect when students see the set of specimens they are going to work with. We collect these specimens so that five specimens, or possibly six, will fit in a small flat rate box, and we keep the price low, as we know these will be used in a classroom. For teachers we count like a baker and a dozen is more than 12, since you will always need a few spares.  If you are a teacher, let us know.
You are buying a unit of five student specimens. The photo is representative of what we ship.
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