346 GEOLOGY OF THE NARRAGANSETT BASIN. 



This is also true of the inclination of the strata on the western side of 

 Prudence Island and on the western side of Conanicut. The shale series 

 east of Mackerel Cove and on Freebodys Hill seems also to have low dips. 

 North of Barbers Height, toward Hamilton and northwestward, the dips 

 also become lower, indicating a greater horizontal extension of the series 

 for the same thickness of strata than exists farther southward. The evi- 

 dence on Potowomut Neck is in favor of low dips. 



If these areas of low dips among those of higher dips can be con- 

 sidered as evidences in favor of a system of local folding, at })resent only 

 obscurely known, it will not be necessary to assign any extravagant thick- 

 ness to the more northern portion of the Saunderstown series. 



Rocky Point conglomerate and its connection with the estimate of the thickness of the northern section. 



Unfortunately, the estimate of 11,200 feet for the Kingstown series in south- 

 western Cranston and in Warwick does not offer a means of comparison 

 with the more southern section noted above, because (1) it does not include 

 the Rocky Point conglomerates, supposing that the latter lie at the top 

 of the Kingstown sandstone series, and (2) it is not determinable that the 

 rocks immediately beneath the Rocky Point conglomerates belong to the 

 sandstone series, for the reason that the age of the Rocky Point conglom- 

 erate is not known with certainty. In the field investigated by the writer 

 there is no evidence militating against the belief that these conglomerates 

 correspond to those which begin to occur near the top of the Aquidneck 

 shales as exposed northeast of Warren, and which are there an introduc- 

 tion to the Dighton conglomerates. In the area north of that investigated 

 by the writer, the Rocky Point conglomerates, or rather their supposed 

 equivalents, seem to occur at a horizon corresponding more nearly to the 

 top of the Kingstown sandstone series, similar to the conglomerate of 

 western Bristol Neck and western Prudence Island. This is equivalent to 

 placing them on the horizon of the Seekonk group of Mr. Woodworth, 

 which includes also the series of shales, sandstones, and medium conglom- 

 erates into which the Aquidneck shales merge north of Warren. 



chief features of the Kingstown series. — The Kingstown sandstone series may be 

 described as a complex consisting of alternations of shale, sandstone, and 

 conglomerates. The conglomerates are usually made up of very small 

 pebbles. Near the base of the section, however, in the basal arkoses and 

 associated rocks there occur layers with large pebbles. Toward the top of 



