277
Geologic features 278

FULLER'S EARTH 278
Economic features 278
Geologic features 279

GRAPHITE (PLUMBAGO) 279
Economic features 279
Geologic features 282

GYPSUM 283
Economic features 283
Geologic features 284

MICA 285
Economic features 285
Geologic features 287

MONAZITE (THORIUM AND CERIUM ORES) 288
Economic features 288
Geologic features 289

PRECIOUS STONES 289
Economic features 289
Geologic features 291

SALT 294
Economic features 294
Geologic features 295

TALC AND SOAPSTONE 299
Economic features 299
Geologic features 299

CHAPTER XIV. EXPLORATION AND DEVELOPMENT 301

THE GENERAL RELATIONS OF THE GEOLOGIST TO EXPLORATION AND
DEVELOPMENT 301

PARTLY EXPLORED VERSUS VIRGIN TERRITORIES 303

THE USE OF ALL AVAILABLE INFORMATION 304

COOPERATION IN EXPLORATION 305

ECONOMIC FACTORS IN EXPLORATION 306

GEOLOGIC FACTORS IN EXPLORATION 307

MINERAL PROVINCES AND EPOCHS 308

CL