PURE SCIENCE 
551.0 
J] 
71 
M2 
73 
731 
732 
74 
75 
76 
77 
=8 
=f 
782 
783 
79 
791 
8 
81 
82 
33 
4 
25 
86 
87 
88 
89 
9 
oI 
02 
93 
a4 
95 
96 
97 
08 
QQ 
Metamorfism 
Stratigrafic geology 
Archean 
Primary, paleozoic, Cambrian 
Silurian 
Lower Silurian 
Upper Silurian 
Devonian Old red sandstone 
Carboniferous 
Secondary, mesozoic, triassic and Jurassic: lias, oolite 
Cretaceous 
Tertiary, cenozoic 
Eocene, oligocene 
Miocene 
Pliocene 
Quaternary Postpliocene Glacial 
Recent 
Structural geology 
Stratification 
Curvature and contortion 
Ripple marks and sun cracks 
Joints Cleavage Polarity in rocks 
Dip Outcrop Strike 
Anticlinal Synclinal 
Faults and folds Dislocations 
Veins Dykes Necks Bosses 
Agents of geologic work 
Frost 
Water 
Atmosphere 
Geochemistry 
Chemic changes: heat. See also note to 551 
Animals 
Coral reefs 
Plants 
Segregation and concretion 
Other agents