Geology of the Alton Quadrangle, New Hampshire |
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50 cents accumulated aeromagnetic survey Alonzo Quinn Alton Bay Alton quadrangle andalusite crystals Binary granite biotite Blue Hills Range Blue Job clay coarse-grained contours Conway granite corner crops DEVELOPMENT COMMISSION Devonian period Early Devonian Farmington feldspar folded foliated geologic map gneisses H. M. Bannerman Hampshire Plutonic Series HAMPSHIRE STATE PLANNING hornblende igneous rocks illus inch Inland Sea Jenness Pond member Katharine Fowler-Billings Lake Winnipesaukee Lawrence Goldthwait Littleton formation magma magnetic minerals Marland medium-grained Merrymeeting Lake metamorphic rocks mica miles million years ago Mountain Plutonic Series mud and sand muscovite northwest occurs orthoclase Parker Mountain pegmatite Pittsfield member places PLANNING AND DEVELOPMENT pyrrhotite pyrrhotitic schist quartz diorite quartzite Reprinted 1949 road sand and gravel schists sedimentary rocks sediments shales shown sillimanite southeast Southeastern New Hampshire Spaulding Turnpike Strafford strike and dip T. R. Meyers true north U. S. Route underlain village of Farmington White Mountain Plutonic Winnipesaukee quartz diorite