4 
226 T. N. Dale—Geology of Rhode Island. 
and red jasper on the beaches about Brenton’s Point, probably 
originated here. At 90, which is 200 feet from the “ Flinty 
ES 
with a similar dip. t 94, opposite the harbor, are exposed ab 
low tide green and purple slates containing nodules and pebbles 
of dolomite and red jasper, alternating with layers of a pinkish, 
yellowish, dolomite with veinlets of quartz like the dolomite 
in the eastern “Lime Rock” and enclosing pieces of slate. A 
microscopic section of it shows nothing but the structure char 
acteristic of limestone. These beds strike N.E., and the dip, 
C. H. Hitchcock found to be 40°S.B- 
1 x $ mile in area generally consisting of a pinkish and a greenish | 
feldspar, quartz and chlorite At 101, this is traversed by one 
large and several small veins of milky quartz striking N.We" 
S.E. and dipping N.E. Near 100, the pink feldspar occurs 1D 
large crystals, and at 100 the protogine is seen in contact with 9 
siliceous argillyte, the two rocks being literally dovetailed ine 
each other. This is due to faulting as may be seen from 4 eae 
foot long vein close by, which is faulted ten times. This pre : 
ous argillyte passes shortly into a serpentine and epidote s¢ aie 
containing nodules of crystallized epidote and some quart? Fhe : 
bles, resembling generally the schist at 15, at the end o Be 
oe He p. 131; see also Jackson, pp. 34, 91, 246, and Ed. Hitcheock, ie . 
