xii CONTENTS 
CHAPTER 2ex) 
ALTERATION AND METAMORPHISM 
PAGE 
Rock-changes induced by Epigene Action. Deep-seated Alteration 
or Metamorphism. Degrees of Metamorphism. Thermal 
or Contact Metamorphism. Regional Metamorphism— 
Plutonic, Hydro-chemical, and Dynamo-metamorphism 212-227 
CHAPTER Gy i 
ORE-FORMATIONS 
Syngenetic Ore-Formations—Native Metals and Ores in Igneous 
Rocks; Ores in Bedded Rocks (Chemical Precipitates, 
Clastic Ores, Ores in Schists). Epigenetic Ore-Formations— 
Fissure Veins or Lodes; Nature of Fissures; Width and 
Extent of Lodes; Simple and Complex Lodes; Transverse 
and Coincident Lodes; Systems of Lodes ; Branching and 
Intersection of Lodes; Heaving of Lodes; Contents of 
Fissure Veins; Structure of Fissure Veins; Outcrop of 
Lodes ; Gossans; Association of Ores in Lodes ; Succession 
of Minerals in Lodes ; Walls of Lodes ; Stockworks . 228-254 
CHAPTER Weviit 
ORE-FORMATIONS—continued 
Bedded Veins or Quasi-bedded Ore-Formations. Irregular Ore- 
Formations—Masses occupying Cavities; Metasomatic Re- 
placement ; Impregnations ; Disseminations; Contact Ore- 
Formations. Origin of Ore-Formations—Magmatic Segrega- 
tion Ores; Magmatic Extraction Ores; Secretionary Ores ; 
Sedimentary Ores ; Theories of Lateral Secretion and 
Ascension 5 : - 255-272 
CHAPTER <yvam 
GEOLOGICAL SURVEYING 
Geological Surveying. Field Equipment. Topographical Maps. 
Data to be mapped. Various Scales of Maps. Signs and 
Symbols. Tracing of Exposed Outcrops. Tracing of Con- 
cealed Outcrops—Evidence supplied by Soils and Subsoils, 
by Vegetation, by Form of Surface, by Springs, by Index- 
beds, by Alluvial Detritus. Carrying Outcrops across 
Superficial Formations . ; : . : 273-290 
