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Fig. 6. Airborne magnetic anomalies (magenta) overlain on topographic data. The magnetic anomalies are found in depressions on Copper Ridge. These depressions reflect dolines (sinkholes) on the ridge in which Fe rich sediments have collected. The dolines are often oriented perpendicular or parallel to the strike of Copper Ridge suggesting an association with joints in the bedrock. Data in the white area (center) was omitted due to magnetic interference from buildings. The black dot marks the magnetically anomalous area from which the more magnetic soil core was extracted. The less magnetic core was extracted outside the same anomaly.
