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Sandstone :: Sandstone (n.) A rock made of sand more or less firmly united. Common or siliceous sandstone consists mainly of quartz sand.

Graduate :: Graduate (v. i.) To pass by degrees; to change gradually; to shade off; as, sandstone which graduates into gneiss; carnelian sometimes graduates into quartz..

Tilestone :: Tilestone (n.) A kind of laminated shale or sandstone belonging to some of the layers of the Upper Silurian.

Scolithus :: Scolithus (n.) A tubular structure found in Potsdam sandstone, and believed to be the fossil burrow of a marine worm..

Flag :: Flag (n.) Any hard, evenly stratified sandstone, which splits into layers suitable for flagstones..

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

Ludlow Group :: Ludlow group () A subdivision of the British Upper Silurian lying below the Old Red Sandstone; -- so named from the Ludlow, in Western England. See the Chart of Geology..

Arenilitic :: Arenilitic (a.) Of or pertaining to sandstone; as, arenilitic mountains..

Firestone :: Firestone (n.) A 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..

Fucoidal :: Fucoidal (a.) Containing impressions of fossil fucoids or seaweeds; as, fucoidal sandstone..

Grit :: Grit (n.) A hard, coarse-grained siliceous sandstone; as, millstone grit; -- called also gritrock and gritstone. The name is also applied to a finer sharp-grained sandstone; as, grindstone grit..

Dinosauria :: Dinosauria (n. pl.) An order of extinct mesozoic reptiles, mostly of large size (whence the name). Notwithstanding their size, they present birdlike characters in the skeleton, esp. in the pelvis and hind limbs. Some walked on their 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..

Otozoum :: Otozoum (n.) An extinct genus of huge vertebrates, probably dinosaurs, known only from four-toed tracks in Triassic sandstones..

Foralite :: Foralite (n.) A tubelike marking, occuring in sandstone and other strata..

Silex :: Silex (n.) Silica, SiO2 as found in nature, constituting quarz, and most sands and sandstones. See Silica, and Silicic..

Clastic :: Clastic (a.) Fragmental; made up of brok/ fragments; as, sandstone is a clastic rock..

Asterolepis :: Asterolepis (n.) A genus of fishes, some of which were eighteen or twenty feet long, found in a fossil state in the Old Red Sandstone..

Ichnite :: Ichnite (n.) A fossil footprint; as, the ichnites in the Triassic sandstone..

Toph :: Toph (n.) kind of sandstone.

Quartzite :: Quartzite (n.) Massive quartz occurring as a rock; a metamorphosed sandstone; -- called also quartz rock.

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