. Geology of the Narragansett basin. Geology. 156 GEOLOGY OF THE lif AERA GANSETT BASIK the phenomena of the Wamsutta series in North Atileboro and the under- lying terrane of schists with intrusive granite-porphyries in Cumberland into an interpretable relation. On the one hand, we have the effusive products of volcanic action; on the other hand, the underground conduits and rents filled with their equivalent portions of the magma. The same story is fairly derived from the Blue Hill region on the north side of the Norfolk County Basin. The beginning of sedimentation in this part of the Carbon
. Geology of the Narragansett basin. Geology. 156 GEOLOGY OF THE lif AERA GANSETT BASIK the phenomena of the Wamsutta series in North Atileboro and the under- lying terrane of schists with intrusive granite-porphyries in Cumberland into an interpretable relation. On the one hand, we have the effusive products of volcanic action; on the other hand, the underground conduits and rents filled with their equivalent portions of the magma. The same story is fairly derived from the Blue Hill region on the north side of the Norfolk County Basin. The beginning of sedimentation in this part of the Carboniferous land area appears clearly to have been accompanied by extensive acid eruptions. It is probable, as above noted, that the large felsite area about Boston was formed also in Wamsutta time. How much later the action continued can not be readily determined. The intrusion of pegmatitic granites in the southern arm of the Narragansett Basin, in the vicinity of Watsons Pier, together with the marked local meta- morphism of all the Carboniferous strata in that portion of the area, shows that volcanic action held on there later than in the noi'thern fields, if it did W5W M///ers /?/i/er Abbots fiun Hopp/nMf// ENE. rio 15 —Geological section m tlae Millers River region not altogether take place later than the deposition of the Carboniferous strata in this part of the continent 1 oldiinG of the wamsutta group The folds of the strata of the red Wamsutta series in North Attleboro axe the most complicated that have been found in the Narragansett Basin. The large horseshoe-shaped area of red rocks above described wraps around the older granitite and Cambrian rock of Hoppin Hill, so that the general structure is anticlinal; but the dips of the beds are now in many places inward toward the center, giving rise to an apparent synclinal structure. On the east, from the village of North Attleboro southward to South Attleboro, the dips of the red beds are mainly inward toward the Hoppin Hi
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectgeology
