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GEOPHYSICAL METHODS OF EXPLORATION
PHOTOGEOLOGY APPLIED TO GEOPHYSICAL SURVEYS
adjoining unsurveyed areas aerial photos Agocs airborne magnetometer alpha particles anomaly in relation anomaly is considered August 1948 Scale Baffin Island base maps Beta particles Blairton Anomaly camp sites Canada RCAF contacts Cornell University Crow Lake Anomaly deposit of magnetite depth detect anomalies determine dip needle earth's magnetic field economic deposit electromagnetic establish recognition criteria fault field crews field of force flight lines formations gamma geology geophysical data geophysical methods geophysical survey gneiss and marble gravity ground geo high temperature replacement host rock identify lithology igneous rocks investigation landform lithology and structure locate magnetic balance magnetic data magnetic surveying Marmora Anomaly Marmora area mineralizing solutions mosaic Ontario Ordovician limestone peak value petroleum Photogeologic methods photogeology Photogrammetry photographs plotted pyrrhotite radioactive rock types scintillation counter sedimentary sedimentary basin Seismic methods selected soils struc Structural features study area terrain traverse lines tural type of rock undifferentiated pre-Cambrian gneiss velocity west of Crow