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Potsdam Group :: Potsdam group () A subdivision of the Primordial or Cambrian period in American geology; -- so named from the sandstone of Potsdam, New York. See Chart of Geology..

Brontozoum :: Brontozoum (n.) An extinct animal of large size, known from its three-toed footprints in Mesozoic sandstone..

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

Scrubstone :: Scrubstone (n.) A species of calciferous sandstone.

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

Molasse :: Molasse (n.) A soft Tertiary sandstone; -- applied to a rock occurring in Switzerland. See Chart of Geology.

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

Sarsen :: Sarsen (n.) One of the large sandstone blocks scattered over the English chalk downs; -- called also sarsen stone, and Druid stone..

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..

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..

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..

Brownstone :: Brownstone (n.) A dark variety of sandstone, much used for building purposes..

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..

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

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

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

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

Scale :: Scale (v. i.) To separate and come off in thin layers or laminae; as, some sandstone scales by exposure..

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

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

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