COARSE CONGLOMERATE OF NORTHERN AQUIDNECK. 3V3 



shales beneath the city of Newport. The contact with the top of the coarse 

 conglomerate is unconformable. Coaly shales of considerable extent are, 

 however, suggestive of Aquidneck shales, since these are the only shales 

 having any great distribution over wide areas. This would place the rocks 

 beneath the city of Newport in the Aquidneck series and beneath the cliff 

 exposure. Either a fault or a close overturned synclinal fold must be 

 hypothesized to account for the present position of these rocks. 1 Professor 

 Dale notes the presence of slates and conglomerates at Emmanuel Chapel, at 

 the corner of Spring and Perry streets. Conglomerates occur in Morton Park. 



Portsmouth synclinal conglomerate. — Near the summit of the Portsmouth syn- 

 cline the upper green shales begin to contain sandstone and some small- 

 pebbled conglomerate layers, overlain at various localities, it seems, by 

 sandstone and coarse conglomerate. Coarse conglomerate occurs, for 

 instance a third of a mile south of Butts Hill, in the Portsmouth camp- 

 meeting grounds north of Quaker Hill, and on the east side of the Newport- 

 Bristol Ferry road, half a mile west of Quaker Hill. This conglomerate, 

 associated with much sandstone, is believed to have been introductory- to 

 the coarse conglomerate series, which once must have lain above it. 



East of the Portsmouth syncline there must have been an anticline 

 (merging southward perhaps into a monocline), in order to enable the 

 coarse conglomerate to appear at sea level on the eastern side of the Sakon- 

 net River from Fogland Point to the eastern side of Nannaquacket Pond. 



Conglomerates of Warren Neck and Swansea. Tile COai'Se Conglomerate eXpOSUreS 



from the western side of Wan-en Neck to Coles Station, along both banks 

 of Lees River north of the southern road to Fall River, and thence north- 

 ward to Swansea village, as well as the exposures found north of the west- 

 ern Warren Neck exposures, at Luthers Corner and in western Swansea, 

 are all considered as corresponding to the coarse conglomerate series lying 

 to the southward. 



Thickness of the coarse conglomerate. — The thickness of the coarse conglomerate 

 in the Black Point-Taggarts Ferry section was estimated to be at least 380 

 feet. This may not include the entire section, a part of the conglomerate 



'Prof. T. Nelson Dale, in his paper on the Geology of the Mouth of Narragansett Bay (Proc. 

 Newport Nat. Hist. Soc, Document 3, pp. 6-14, Newport, R. I., 1885), gives a somewhat different 

 interpretation of the general section of this part of the basin from that presented by Dr. Foerste. 

 The most notable difference concerns the position of the quartzite conglomerate, which Dale places 

 below the coal-bearing portion of the section. — X. S. S. 



