. Geology of the Narragansett basin. Geology. OVEETHEUST PHENOMENA. 27 faults, there is no tendency of faulted blocks to ride over one another. It can readily be understood that, inasmuch as this region has been subjected to very extensive erosion, overthrusting which was preceded by the collapse of the folds might have all the marks of its former existence destroyed by the removal of the strata which were involved in the movement An ideal section (fig. 2) drawn by Mr. Woodworth through the three great synclines in which the Dighton group appears, including the Attleboro syncline on the north,
. Geology of the Narragansett basin. Geology. OVEETHEUST PHENOMENA. 27 faults, there is no tendency of faulted blocks to ride over one another. It can readily be understood that, inasmuch as this region has been subjected to very extensive erosion, overthrusting which was preceded by the collapse of the folds might have all the marks of its former existence destroyed by the removal of the strata which were involved in the movement An ideal section (fig. 2) drawn by Mr. Woodworth through the three great synclines in which the Dighton group appears, including the Attleboro syncline on the north, the Great Meadow Hill trough in the middle of the basin, and the Swansea syncline on the south, exhibits a symmetry in the cross section which is further evidence of the simplicity of the larger features of structure of the central part of the basin. There is along this line of section a great broad syncline in the middle of the basin. It has nearly symmetrical slopes with relatively low dips The synclines parallel ^y/7c///?e/'"'''''^^^^^^ sync/me ^^^^â^ s/J7C///7e. Fig 2 â âIheoretical plan of the great foWs of tlie Narragan^sett Ras»ni with it on the north and south have their axial planes inclined away from the middle syncline, or, in other words, the sides of the synclines facing the middle area are nearly vertical. A plane lying in this region of folding would have been deformed so as to give a cross section like that in fig. 2. T'here is in this case no prevailing pitch of the axial planes to or away from the ocean or an older land mass, but rather a symmetrical deformation of beds with reference to the middle line and sides of the basin as it now exists. BIKE ROCKS OF THE BABIK. Although, as before stated, the systematic study of the igneous rocks of this area has not been undertaken, there are certain features connected with their distribution which deserve notice. These concern the areas in which the intrusions occur and the portions of the great section wh
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