284 ZN. Dale-Geolagy of Rhode Island. 
granite or gneiss ledges occur. Jackson, on bis map, indicates 
plumbago in granite two miles west of Bonnet Point, and the 
range of Tower Hill back of the river he has down as granite 
and gneiss. 
CoNCLUSIONS. 
Stratigraphical_—From the stratification at 46, 58, 17, on 
Newport Neck, and at 148, near Narraganset Pier, it is evident 
that the protogine masses of that neck are not intrusive, and it 
is therefore improbable that that of Conanicut is so. As pro- 
togine occurs also at West Island, and thus on both sides of 
the Carboniferous basin, it seems highly probable that all these 
masses .of protogine belong to the same metamorphic bed or 
series of beds, and that these isolated masses in the center 
were thrown up either before or after the deposition of the Car- 
boniferous strata or partially at both times. No eastward dips 
have been observed in the eastern half of the main protogine 
tract of Newport Neck, but for convenience such have been 
assumed. If the dip is uniformly W.N.W., a fault must be 
assumed at Almy’s Pond between the protogine and the Car- 
boniferous beds, or an original unconformity must be supposed 
to have been subsequently changed to a conformity in direc- 
tion, but not in angle of dip; for the metamorphism of a bed 
overlying carbonaceous, fossiliferous beds into protogine ve : 
highly improbable and intrusion. has been shown to be out 0 
the question. 
In intimate contact with these isolated masses of protogine 
we find, at the Dumplings and Bailey’s Beach, certain epidotic 
and chloritic schists, some parts of which closely resemble the — 
chlorite schist of ‘‘ Paradise,” which, therefore, on lithological 
grounds, would, together with its associated mica schists, seem 
n 
Rose Islands we find them below the “ Quartz and Clay Aggte 
ate.” The dotted line on the map, from Castle Hill to Rose — 
sland, the Gull Rocks, Coaster’s Harbor Island, Little Lime — 
Rock and Brenton’s Cove, bounds the probable submarine ¢X- _ 
tension of these rocks near Newport. Bai the western bound- 4 
ary of this tract almost touches the chloritic and epidotic © 
schists of the Dumplings, which dip about easterly; and the — 
chloritie argillytes of the northern half of Newport Neck dip 
H.S.E.; therefore, probably, the latter overlie the former 
pe 
Bl 
Bi 
Again, the chloritic argillytes at 71, west of Price’s Neck, are 
underlaid by a layer of ferruginous chlorite, which occurs also 
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