WESTERN COARSE CONGLOMERATE EXPOSURES. 369 



75 feet. If it lies anywhere near the base of the syncline the trough dips 

 strongly southward, since the base of the conglomerate series near the 

 southern end of the Paradise region must lie far below sea level. The 

 quartzitic shales forming the central parts of the Paradise-Hanging Rock 

 area southward are considered as pre-Carboniferous, the intercalated 

 igneous rocks having penetrated these shales, but not the rocks of Carbon- 

 iferous age. 



Southward pitch of the Sakonnet River syncline. The Syiiclme between SmitllS Beach, 



Taggarts Ferry, and Black Point on the west, High Hill Point on the 

 north, Windmill Hill on the northeast, and an unexposed region now occu- 

 pied by the eastern part of the lower Sakonnet River has already been 

 mentioned. The shore exposures west of Windmill Hill as far as Browns 

 Point must once have underlain a continuation of the coarse conglomerate 

 series still exposed at High Hill Point and on the side of Windmill Hill, if 

 such a synclinal structure really exists. At High Hill Point the conglom- 

 erate is exposed at sea level. Southward, opposite Taggarts Ferry and 

 Smiths Beach, the base of the syncline must lie far below sea level, indi- 

 cating a southward pitch of the syncline and adding another instance of 

 the general southward pitching of the rocks in southern Aquidneck. 



From High Hill Point to the northwestern side of Nonquit Pond, and 

 thence to the eastern side of Nannaquacket Pond, the coarse conglomerate 

 is exposed at about sea level and rises to about 80 feet above. The Fog- 

 land Point conglomerate is also at about sea level. The syncline probably 

 does not extend far north of High Hill Point. 



WESTERN COARSE CONGLOMERATE EXPOSURES. 



Lithologically the coarse conglomerates of Miantonomy Hill and 

 Coasters Harbor Island present all the features of the Purgatory con- 

 glomerates on the east, excepting the marked elongation of the pebbles. 

 Since the elongation of the pebbles, wherever it occurs, is a secondary 

 feature, it need not be taken into account. 



Possible syncline immediately west of Miantonomy Hill.— At MiantOllOmy Hill tile COai'Se 



conglomerate pitches southward at an angle of perhaps 15°, conglomerate 

 occurring again at a lower level an eighth of a mile south of the summit 

 of that hill. On Beacon Hill, immediately northward, a conglomerate is 

 exposed, with pebbles usually not exceeding- 8 inches in length. The over- 



MON XXXIII 24 



