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Non-commercial quantities of inflammable gas were found in small vugs and fractures in metamorphosed Grenville (pre-Cambrian) magnesian limestone in the 900- and 1,500-foot levels of the zinc mine at Edwards, St. Lawrence County, New York. The most significant minerals found in the openings containing the gas are salt and gypsum. The geological evidence seems to suggest a natural organic derivation similar to that of commercial accumulations in younger rocks.
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