LT. N. Dale—Geology of Rhode Island. 227 
Cliffs” in Newport. The dip is about easterly. There is a vein 
one foot thick of pink feldspar and quartz like those of 56, Lily 
Pond Beach. Near 99, this rock passes into a chlorite schist 
with a little mica and minute passages of calcite, and is identi- 
cal with that of a portion of Ridge III, “Paradise.” The 
“Dumpling” Islets seem to be of the same character, but the 
one 8.K. of 100 is protogine. At 99, the chloritic and epidotic 
schists terminate. From 98 to 97 the protogine is bounded by 
the regular siliceous argillytes, like those at Newport and Sachu- 
est Necks, which extend to 102, within half a mile of Jamestown 
Ferry ; at the east end of Hamilton avenue, dipping 15°-20° 
-; at 103, more highly inclined and striking W.-S5. 
From 97 to 96 the protogine is bounded by a triangular mass 
a quartz and clay aggregate,” the last outcrop of which is at 
contact. The quartz of the protogine is dark colored, like that 
of the “aggregate” which lies upon it and which contains a 
few layers of dark gray slate. The dip is high and hardly 
determinable, but at 105, dark gray slates dip 10°-15° N. 
nely laminated, argillaceous slate dipping successively 20°-38 
0° N.N.W., 15°-20° N 
North of Mackerel Cove, from 106 to 108, similar light and 
dark gray schists and slates recur, dipping successively 20°-20°, 
45°, 25° ‘and 30° W. .W., with thickly disseminated, minute 
nodules of crystalline siderite, in some places striped across the 
bedding, and’ traversed by quartz veins with crystalline calcite 
which, from its color in weathering, must contain some carbonate 
firon. No satisfactory outerops exist east of the line just fol- 
lowed, but on the east side of the island at 102, beyond the 
northern termination of the siliceous argillytes, the argillaceous 
Slates of the east side of Mackerel Cove recur, dipping at 107, 
y W., a little south of the ferry, 25° S.S.H., at the ferry 
‘S.W., and at Taylor’s Point, 10°-20°S.W. toSS.W. | 
The southern part of Conanicut consists entirely of the sid- 
entice, argillaceous schists described, although in some places 
the siderite is wanting. The overlying rocks occur at Beaver 
nay -_, At 109, south of the Mackerel Cove beach, the schists 
'p 15° N.W., at 110, north of that beach, 25°-80° N.W.; at 
py are dark colored as at 108; at 112 they dip 35°-40 
phe? b 
Similar schists dip 40° S.S.E. to 90°. Between 
and at 113 
