GLOSSARY. 



ACERVULARIA, a genus of fossil corals. 



ACTINOCKINUS, a genus of cricoids. 



AGARICOCRLXUS, a genus of crinoids. 



ALLORISMA, a genus of fossil bivalve shells. 



ALLUVIAL, pertaining to fl.xxls of rivers, or to alluvium. 



ALLUVIUM, deposits caused by fl >o;ls. 



AMPLEXUS, a gejus of fossil corals. 



AXTHRA* ITE, bard mineral coal, not bituminous. 



ANTICLINAL AXIS, a given line or ridge from which strata dip in both 



direcci ons. 

 ANTLIODUS, a genus of fossil fishes. 

 ARCHIMEDES, a genus of Polyzoans with a spiral axis. 

 ARENACE >US, sandy, containing sand. 

 ARGILLACEOUS, clayey, containing c-ay. 

 ATHYR1S, a g_nus of fossil bivalve shells. 

 ATRVPA, a genus of fossil bivalve shells. 

 AULOPOR1, a genus of fossil corals. 

 AULOS IEGES, a genus of fossil bivalve shells. 

 AYICULA, a ge^us of bivalve shells. 

 AVICUL JPEO i EX, a genus of fossil bivalve shells. 

 AXOPHYLLUM, a genus of fossil corals. 

 AZOIC, literally, without life. 

 AZOIC S f RATA, those believed to have been formed before life existed upon 



the earth. 



BELLEROPHOX, a genus of fossil univalve shells. 

 BEYRICHIA, a genus of minute crustaceans. 

 BOTTOM, the low flat land of river-valleys, flood -plains. 

 BOULDER, a transported mass of rock, usually rounded. 

 BRACHIOPODA, a class of mollusks. 



BRECCIA, rock composed of angular fragments of rock or other substances 

 consolidated. 



