Bulletin of the United States Geological Survey--The Rampart Gold Placer Region, Alaska . ;. LEGENDQUATERNARY Alluvim TERTIARY (Kertai formation) CRETACEOUS? Impure sandstone CARBONIFEROUS Peimsylvanian? DEVONIAN Limestones, greenstones, quartzites,recL andblack slates Cherts, slates,and greenstones PRE-DEVONIAN Quartzite-schists, quartz-mi ca schists, painetiferous schists, and crystalline limestone Intrusive granitic andnionzonitic nocks U S. GEOLOGICAL SURVEY BULLETIN NO 280 PL. GEOLOGIC SKETCH MAP OF THS IAMPART REGION, and , 190 APPROXIMATE Si All — — i £

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Bulletin of the United States Geological Survey--The Rampart Gold Placer Region, Alaska . ;. LEGENDQUATERNARY Alluvim TERTIARY (Kertai formation) CRETACEOUS? Impure sandstone CARBONIFEROUS Peimsylvanian? DEVONIAN Limestones, greenstones, quartzites,recL andblack slates Cherts, slates,and greenstones PRE-DEVONIAN Quartzite-schists, quartz-mi ca schists, painetiferous schists, and crystalline limestone Intrusive granitic andnionzonitic nocks U S. GEOLOGICAL SURVEY BULLETIN NO 280 PL. GEOLOGIC SKETCH MAP OF THS IAMPART REGION, and , 190 APPROXIMATE Si All — — i £=- -38

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Keywords: ., bookcentury1900, bookdecade1900, bookidbulletinofun, bookyear1906