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A rock made of sand more or less firmly united. Common or siliceous sandstone consists mainly of quartz sand.

Of or pertaining to sandstone; as, arenilitic mountains. Kirwan.

Of the nature of clay; consisting of, or containing, argil or clay; clayey. Argillaceous sandstone (Geol.), a sandstone containing much clay. -- Argillaceous iron ore, the clay ironstone. -- Argillaceous schist or state. See Argillite.

A sandstone derived from the disintegration of granite or gneiss, and characterized by feldspar fragments. -- Ar*kos"ic (#), a.

, some of which were eighteen or twenty feet long, found in a fossil state in the Old Red Sandstone. Hugh Miller.

An extinct animal of large size, known from its three-toed footprints in Mesozoic sandstone.

A dark variety of sandstone, much used for building purposes.

ogens, under Acrogen. -- Carboniferous formation (Geol.), the series of rocks (including sandstones, shales, limestones, and conglomerates, with beds of coal) which make up the strata of the Carboniferous age or period. See the Diagram under Geology.

begining of the Devonian age in eastern America, so named from the characteristic gritty sandstone marked with impressions of cauda galli. See the Diagram under Geology.

A genus of fossil ganoid fishes found in the old red sandstone or Devonian formation. The head is large, and protected by a broad shield-shaped helmet prolonged behind into two lateral points.

Fragmental; made up of brokas, sandstone is a clastic rock.

o exhibit difference, unlikeness, or opposition of qualities. The joints which divide the sandstone contrast finely with the divisional planes which separate the basalt into pillars. Lyell.

ious strata of this age compose the Devonian formation or system, and include the old red sandstone of Great Britain. They contain, besides plants and numerous invertebrates, the bony portions of many large and remarkable fishes of extinct groups. See the Diagram under Geology.

heir three-toed hind feet, thus producing the large "bird tracks," so-called, of mesozoic sandstones; others were five-toed and quadrupedal. See Illust. of Compsognathus, also Illustration of Dinosaur in Appendix.

ruid stones, a name given, in the south of England, to weatherworn, rough pillars of gray sandstone scattered over the chalk downs, but in other countries generally in the form of circles, or in detached pillars.

stone which will bear the heat of a furnace without injury; -- especially applied to the sandstone at the top of the upper greensand in the south of England, used for lining kilns and furnaces. Ure.

Any hard, evenly stratified sandstone, which splits into layers suitable for flagstones.

A name given to the series of sandstones and schists overlying the true nummulitic formation in the Alps, and included in the Eocene Tertiary.

A tubelike marking, occuring in sandstone and other strata.

Containing impressions of fossil fucoids or seaweeds; as, fucoidal sandstone.