228 T. N. Dale—Geology of Rhode Island. 
inches across, and veined with quartz. At 115 these mica 
schists are interstratified with conglomerate of flat pebbles of 
quartzyte, micaceous and argillaceous schist, dipping 20°-25° - 
H.S.E. At 116 carbonaceous and argillaceous schists dip 45° EK. 
S. The siderite schists on the west shore of Mackerel Cove, 
from 109 south to 120, dip successively, 15° E.S.E., 15° N.N.E., 
0°? N.E., 20°-25° N.E., 30° N.E., 25°-80° N.N.E., 20° N.N.E,, 
25°-30° E. by S.E., 15° E.N.E., 10° N.N.E.; at 121 in Hull's 
Cove, 15° N.N.E.; from the west side of Hull’s Cove to Beaver 
Tail Light, successively ; 10°, 830° N.N.W., 5° SS.E., 5°-10° 
N. N.W., 10°-15° W-.S.W., 10°-15 N.N.W., 15° N.N.W., 6 
N.W. or N.N.W., 15° N.W., 10° W.S.W., 30° W.N: W. ; from: 
Beaver Tail Light north to Austin’s Cove on-the west side of 
the island : 80°, 35°, 40°-45°, all W.N.W.; at 124, 40° W.; at 
125, 40° N.N.W. ; at 126, 40°-45° N.W.; and at 127,—N.N.W. 
The following observations were made: From 109 to 120 the 
schist is often minutely plicated, one specimen showing 7 pli- 
cations to the inch, and sometimes folded at high angles. At 
17 is a sheet of schist, broken off from the adjoining outcrop, 
measuring about 5’x5’ x6” which is folded twice at right an- 
gles. At 119 occur veins of quartz, with chlorite and ferrugin- 
ous, crystalline calcite like those between 106 and 108. The 
schists and slates are very finely laminated, greenish gray, 
waxy, possibly slightly talcoid or hydro-micaceous. The ml 
n ules of siderite vary in size and in distribution. Be 
tween 119 and 120 the schists are dark gray; at 120, striped 
light and dark across the bedding. Between 120 and 121 18a 
bed or vein 10 feet thick of a much decomposed, micaceous, 
siliceous and ferruginous rock. At 122, the dark gray slates 
recur with cubical pyrite, and continue to Lion’s Head, with 
one vein of quartz and calcite. The dark gray schist passes 
both vertically and horizontally into the light colored. At 
Lion’s Head, are striped schists. At 123 there is a vein pe ee 
3 feet thick, running N.W.-S.E. at high angle, of ae 
quartz with cubical pyrite and crystalline calcite. Ne 
ver Tail Light, the beds are slightly ochraceous; on the. ipo ; 
side, north of the Light, they are alternately light or icchste 
striped; at 124, a vein like that of 123. At 126 the oxidize 
nodules of siderite stand out on the weathered schist which 8 
finely veined with quartz. The largest nodules measure" — 
mm. in diameter. At 127, the summit of a 120 foot hill, 18 Ke i 
outcrop, traceable for about 1200 feet, consisting at the ith e, 
end of siderite schist which passes northward and horizontally 
into a micaceous schist. : 
[To be continued. ] 
llaceous 
