334 GEOLOGY OF THE NARRAGANSETT BASIN. 



feet. The sections from South Ferry to the exposures nearest Saunders- 

 town can, on account of these low dips, be estimated at about 350 feet, 

 making a thickness of 1,700 feet from the eastern part of the Bonnet to 

 Saunderstown. As the strata along' the shore approach Saunderstown from 

 the south, the dip along the strike increases, until north of Saunderstown it 

 becomes nearly vertical. Then the dips, continuing along the strike, become 

 35° and 45° E., but in the section across Hazzard's quarry (PI. XXI) and 

 westward to the top of Barbers Height the prevailing dip varies between 50° 

 and 65° E., adding about 2,200 feet to the 1,700 feet already accounted for, 

 making a total of 3,900 feet for the section between the eastern part of the 

 Bonnet and Barbers Height. To this must be added at least 1,600 feet 

 more, in order to include the exposures south of the road nearly half a 

 mile west from the top of Barbers Height, making a total section of 5,500 

 feet for the thickness of the Carboniferous from the Bonnet to the locality 

 just mentioned. Making allowance for the change in the strike of the rocks 

 toward the west of north, on going northward, a thickness of at least 3,600 

 feet must be added, in order to include both the exposures at Indian 

 Corner and those at the locality half a mile south of the corner, east of 

 the road, so that an estimate of 9,100 feet for that part of the Saunderstown 

 sandstone series exposed on the western shore of the bay would be very 

 moderate if the strikes and dips of the scattered exposures were considered 

 as fairly representing the general structure of the strata beneath the soil. 

 This estimate seems excessive, and a series of close synclines and anticlines, 

 or of faults, may be imagined in order to reduce it to more moderate dimen- 

 sions. It should, however, be remembered that at present no facts are 

 known in this part of the field warranting such an interpretation of the 

 structures actuall)^ observed. For a continuation of the discussion of the 

 thickness of the Kingstown series in the southwestern part of the Narra- 

 gansett Bay area, see page 336. 



Kingstown series in southwestern Cranston and western Warwick. At the preSdlt Stage of 



inquiry it does not appear safe to make many statements as regards the 

 equivalency of the Kingstown group north of East Greenwich to rocks 

 exposed in the southern part of the field. The coarse conglomeratic 

 sandstone at Hills Grove may belong to the Saunderstown series. The 

 medium-grained sandstone east of Hills Grove and southwest of Norwood, 

 with its bluish-gray color, is very similar to some of the sandstones exposed 



