Contributions to the Stratigraphy of New England

abundant amphibolite andalusite andesite belt Berkshire massif biotite biotite gneiss boundary Brook calc-silicate calc-silicate gneiss calc-silicate rocks calcareous calcite Cambrian chlorite cm thick coarse-grained conglomerate Connecticut correlation deposits Devonian dikes east epiclastic exposed facies fault zone feldspar feldspathic felsic fine-grained Flesh-pink folds foliation FORMATIONS OR MEMBERS garnet geology gneiss grained granite Granodiorite granulite gray graywacke Hartland Unit Hill Hoosac Formation hornblende interbedded interlayered intrusive laminated layers lenses locally LOCATION ft lower mafic Maine Marlboro Formation Massachusetts massive medium-grained metamorphic microcline minerals mudstone muscovite Nashoba Formation Newbury northwest Ordovician outcrops overlying Paleozoic pegmatite Penobscot phyllite pink plagioclase plutonic Pond porphyroblasts Precambrian protoliths quadrangle quartz quartzite Rb-Sr rhyolite rock types rusty-weathering sandstone schistose sedimentary sediments sequence shale sillimanite sills siltstone Silurian southeast Straits Schist stratified stratigraphic structures Subtotal sulfidic Survey TABLE tectonic thin tuff tunnel Tyringham U.S. Geol unconformity upper volcanic rocks volcaniclastic Waramaug