A rock made of sand more or less firmly united. Common or siliceous
sandstone consists mainly of quartz sand. Different names are aplied to
the various kinds of sandstone rock
according to their composition; as, granitic, argillaceous, micaceous,
etc. Flexible sandstone, the finer-grained variety of itacolumite, which
on account of the scales of mica in the lamination is quite flexible.
Red sandstone, a name given to two extensive series of British rocks in
which red sandstones predominate, one below, and the other above, the
coal measures. The formation of sandstone
involves two aspects.First,layers of sand precipitation of accumulation
of results from either water or air.The most common of the cementing
material is silicon and calcium carbonate can usually be deduced from
the cancellation or from sand buried the color changes are usually brown
or yellow.Red sandstone of the west and southwest, England and wales,
and central and Mongolia from sedimentary sand dunes how irregular shape
and fluent weathering patterns and wavy lines being colored.These were
formerly known as the Old and the new Red Sandstone respectively, and
the former name is still retained for the group preceding the Coal and
referred to the Devonian age, but the term New Red is now little used.
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