COARSE CONGLOMERATE OP HANGING ROCKS. 367 



a closely folded synclinal structure with its axis so far westward, it must be 

 of limited longitudinal extent. 



Hanging Rock ridge possibly the eastern side of an anticlinal fold. Tile Hano'mc RoC'lv 



coarse conglomerate ridge also agrees, lithologically, to a remarkable degree 

 with the Purgatory- Paradise and the Sakonnet River western shore con- 

 glomerate. Its dips are very steep to the westward. If the two western 

 Paradise ridges were considered as forming a close syncline, the Hanging 

 Rock ridge could be regarded as the eastern side of an anticline lying east 

 of that syncline. The Various exposures of conglomerate east of the Hang- 

 ing Rock ridge, in the woods and. in the fields immediately east of the 

 stream, would then necessarily require interpretation as the eastern side of 

 a second syncline, while the Sakonnet River western shore exposures would 

 in their turn form the eastern side of the next anticline. In the absence of 

 clear evidence on this point, the steep, nearly vertical, western dip of the 

 Hanging Rock ridge is almost as favorable to this interpretation as to any 

 other, although requiring an anticlinal fold slightly overturned toward the 

 east in order to make the steeply westward-dipping Hanging Rock ridge 

 the eastern side of an anticlinal fold. 



Dips immediately east of Hanging Rock ridge. Opposite the middle length of tile 



Hanging Rock ridge a small conglomerate ridge forms a promontory pro- 

 jecting southward into Gardners Pond. Its dip is from 80° W. to vertical. 

 On the southeastern side of this promontory a more eastern exposure dips 

 60° E. Northward along the strike from this promontory the dip is 40° E., 

 and remains east to a point east of the northern end of the Hanging Rock 

 ridge. An exposure east of that point dips 80° E. These dips are cer- 

 tainly very unfavorable to any view making the Hanging Rock ridge the 

 western side of a syncline and the more eastern exposures near by , in the 

 woods and fields, the eastern side, as suggested in the preceding paragraph. 

 The dips at the Hanging Rock ridge and eastward, if considered apart from 

 any question of correlation between the Hanging Rock conglomerate and 

 that along the western shore of the Sakonnet River, are certainly more 

 favorable to the supposition of a local anticline, and this is the view taken 

 by Profs. T. N. Dale, Crosby, and Barton, who visited this locality to 

 compare dissenting opinions. 



interpretation adopted. — The interpretation adopted by the writer accepts the 

 eastward dips of the main Purgatory-western Paradise ridge as indicative 



