Salient Angle. In a zigzag line a a are the salient angles, b b the re-entering angles. Etym., salire, to leap or bound forward.
Salt Springs. Springs of water containing a large quantity of common salt. They are very abundant in Cheshire and Worcestershire, and culinary salt is obtained from them by mere evaporation.
Sandstone. Any stone which is composed of an agglutination of grains of sand, whether calcareous, siliceous, or of any other mineral nature.
Saurian. Any animal belonging to the lizard tribe. Etym., σαυρα, saura, a lizard.
Saxicavous. Hollowing out stone.
Schist is often used as synonymous with slate; but it may be very useful to distinguish between a schistose and a slaty structure. The hypogene or primary schists, as they are termed, such as gneiss, mica-schist, and others, cannot be split into an indefinite number of parallel laminæ like rocks which have a true slaty cleavage. The uneven schistose layers of mica-schist and gneiss are probably layers of deposition, which have assumed a crystalline texture. See "Cleavage." Etym., schistus, adj. Latin, that which may be split.
Schistose Rocks. See "Schist."
Scoriæ. Volcanic cinders. The word is Latin for cinders.
Seams. Thin layers which separate two strata of greater magnitude.