GLOSSARY. 



Tertiary Strata. " A series of sedimentary rocks, with char- 

 acters which distinguish them from two other great series of 

 strata, the secondary and primary, which lie beneath them." 



Testncea. '* Molluscous animals, having a shelly covering." 



Tepid. Warm. 



Thermal. Hot. 



Thin out. Strata which diminish in thickness until they dis- 

 appear are said to thin out. 



Trap — Trappean Rocks. Ancient volcanic rocks, composed 

 cf feldspar, hornblende, and augite. Basalt, greenstone, amyg- 

 daloid, and dolerite, are trap rocks. 



Travertin. " A concretionary limestone, hard and semi- crys- 

 talline, deposited from the water of springs." 



Tufa Calcareous. *' A porous rock, deposited by calcareous 

 waters on exposure to air, and usually containing portions of 

 plants and other organic substances incrusted with carbonate of 

 lime." 



Tufaceous. A texture of rock like that of tuff. 

 Tuff or Tufa. " An Italian name for a volcanic rock of an 

 earthy texture." 



CJ. 



Unconformable, See Conformable, 

 V 



Veins. Cracks and fissures in rocks filled with -stony or me- 

 tallic matter. Most of the ores are obtained from metallic veins. 



Z. 



Zoophytes. Coral sponges and other aquatic animals allied 

 to them. 



THE END. 



