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Keywords from Image Description:
GreatFallstectoniczone. en Map of Montana in black and white with Great Falls Tectonic Zone marked and captioned Location of tectonic zone per Thieben Scott and Spry Paul The Geology and Geochemistry of CretaceousTertiary Alkaline Igneous RockRelated GoldSilver Telluride Deposits of Montana USA In Mineral Deposits From Their Origin