IGNEOUS AND METAMORPHIC ROCKS

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IGNEOUS AND METAMORPHIC ROCKS OF THE BLACK HILLS
FIELD COURSE
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PRECAMBRIAN
ANCIENT GRANITIC GNEISS - about 2.5 billion yrs
old METAMORPHOSED SEDIMENTS - now schists,
phyllites IGNEOUS ROCKS - example Harney Peak
Granite, 1.74 b.y
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PRECAMBRIAN
METAMORPHOSED SEDIMENTS - now schists, phyllites,
iron formations
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PRECAMBRIAN
METAMORPHOSED SEDIMENTS - HOMESTAKE GOLD DEPOSIT
Credit SUSEL
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PRECAMBRIAN
Harney Peak Granite
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PRECAMBRIAN
Harney Peak Granite
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PRECAMBRIAN
Pegmatites
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TERTIARY
Devils Tower