SANDSTONES
Noun
sandstones
plural of sandstone
Source: Wiktionary
SANDSTONE
Sand"stone`, n.
Definition: A rock made of sand more or less firmly united. Common or
siliceous sandstone consists mainly of quartz sand.
Note: Different names are aplied to the various kinds of sandstone
according to their composition; as, granitic, argillaceous,
micaceous, etc. Flexible sandstone (Min.), 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. 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 Sandstone is now little used, some
of the strata being regarded as Permian and the remained as Triassic.
See the Chart of Geology.
Source: Webster’s Unabridged Dictionary 1913 Edition