T. N. Dale—Geology of Rhode Island. 223 
cove N.W. of 36, gray argillaceous schists, with minute nodules 
of some talcose mineral and ferruginous veinlets, dip 20°-25° 
N.E., reappearing on the W. side at 37, with a dip of 25°-30° 
N.E. The projection S. of 87 is “quartz and clay aggregate” 
like that of Sachuest Neck, with some carbonaceous slate. At 
38, the conglomerate and associated beds commence, dipping a 
little farther north 35°-40° E.S.E, with N.N.W. fissures. The 
peculiar looseness of this conglomerate has been described by 
Prof. Ch. Hitcheock.* The pebbles inerease in size northward, 
the largest about 8 X10 inches; they are rather spherical, 
mainly quartzyte but sometimes argillyte. At 88, it contains 
pieces of carbonaceous slate and of the speckled slate of 36, 
ear 39 a piece over 6 inches wide of alternating lamin 
of anthracite and quartz, like the small veins near Sheep Point.’ 
his may have been a fragment from a seam of impure coal or, 
aS seems quite as probable, from its adhesion to the rock, may 
have been formed at the time of the deposition of the conglom- 
erate. This conglomerate occupies the remainder of the island, 
on the west side with schist and grit, at 39, dipping 25°-80° 
about S.S.E.; at 40, 30°35’ E.S.E., on the northeast side, 
N.N.W. at high angle, and at 41 and 42, with carbonaceous, — 
Speckled slate, 20°-25° N.N.W 
oat Island.— A boring recently made within the fort, after 
Passing through 50 feet of alluvial gravel and clay, entered the © 
chloritic argillytes with passages of calcite for about 150 feet. 
_ Little Lime” Rock (misleading in name).—Chloritic argillyte 
striking N.N.E.-S.S.W. and dipping almost vertically. At 43, 
on Hippee southward to the shore, these rocks recur, dip 15°— 
The Lime Rocks.—The western one is a light gray, inclining 
icro- 
to bluish, dolomite, traversed by veinlets of quartz. mi 
Scopic section shows nothi ng but the structure characteristic of 
limestones, On the south side are a series of joints or layers 
with a rough easterly dip. This grayish dolomite forms also 
the western half of the eastern rock, its other half being a yel- 
Newport Neck.—The line from 44 south to the west sid 
a: Beach forms the eastern boundary of a bed of proto-— 
‘gine, ; i 
