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_ ----_-_-__--_---- Introduction  Purpose and scope of the investigation Geography of the Aroostook manganese belt History of discovery and exploration Fieldwork and methods used Acknowledgments. __--_--__--._ General regional geology Northern manganese district Southern manganese district_-_-__--_-_-__- Maple and Hovey Mountains area. Stratigraphy. Meduxnekeag formation. Slate and graywacke member Ribbon rock member____--_- Slate member. _--_-_--_-_-____ Hovey formation  Lower part of the Hovey formation.__ Slate and graywacke  Saddleback Mountain member.___ Conglomeratic graywacke lens____ Red and purple slate lenses  Upper part of the Hovey formation.__ Slate and graywacke  Dunn Brook member. Volcanic breccia lentils.  Silicic volcanic rocks_  Lenticular manganese deposits__ Age relations of the Meduxnekeag and Hovey formations.-_-___-_._. Spruce Top greenstone Serpentinite and associated rocks.  Garnet porphyry.__.---_-. Granite.  Structure  Metamorphism_ _  Regional metamorphism Contact metamorphism General geology of the manganese deposits.-.---- Stratigraphy --__--____-__-_-_-__-Upper slate_ --_----_-_-_---Main manganiferous lens (Maple-Hovey deposit) ____--__-__-_. Main manganiferous zone in outlying areas_--_ Central Hovey deposit  Lens .E bounded by trenches 93 and 99__-_ Page 1 2 2 3 3 6 6 7 7 8 9 9 9 10 11 12 12 12 12 13 15 16 16 16 17 18 18 21 21 24 28 30 30 30 31 31 33 34 34

u.s. geological survey professional papers/u.s. geological survey professional paper

Geology and manganese deposits of the Maple and Hovey Mountains area, Aroostook County, Maine, with a section on Lithology and mineralogy of the deposits