(7) 
laminated slate, evidently once a part of the adjoining outcrop, 
about 6 inches thick and 4' to 5' square, has been folded twice 
so as to form two angles of nearly 90° each. At Beaver Head, 
on the same island, may be seen some mica schists in a verti¬ 
cal position, folded in and out many times. The jagged ends of 
these folded strata form the edge of a low cliff. But by far the 
most interesting exhibition of these rock plications is to be seen 
on Dutch Island at a little beach midway between the upper and 
lower wharves. (See PI. Ill, fig. I.) On the left side of the 
figure a fold is seen to have resulted in a fault. A little north of 
the upper wharf there is an exposure of about ten feet of mica 
schist strata dipping 6o° N.NW., which have been folded over 
upon themselves so as, right above, to dip 25 0 S.SW. (See PI. 
Ill, fig. II.) A specimen of schist from Dutch Island, measuring 
now 5 2 J"X 10" x $" (when each bend in it is measured,) gives Sp' 
X 10" x£" for its original size, showing a diminution in one exten¬ 
sion of more than 35 per cent. It has three folds lengthwise, 
each forming an angle of 6o°. In many localities on our island, 
instead of small folds in the slate, a single or double angle of 
many degrees occurs, the rest of the rock preserving its general 
level or inclination. This process of bending or creasing is some¬ 
times extended into a faulting. Of this there are many cases a 
little north of the Glen on Sakonnet River, where several such 
miniature faults occur within a space of five feet. 
Double Systetn of Folds. In walking from Mr. Lorillard’s 
breakwater around Ochre Point westward the following dips occur 
in the order given: E.SE., W.NW., E.SE., S.SW., E.SE., 
S.SW. This occurrence was noted by the Hitchcocks years ago. 
O11 the west side of the southern part of Conanicut the dip is 
NW. or N.NW., but on the east side (the west side of Mackerel 
Cove) it is mainly NE. or N.NE. On the west half of Newport 
Neck the chloritic and agillaceous slates about Fort Adams dip E. 
SE., but the same rocks at Castle Hill and Graves Point dip NE. 
and even N.NW. Leaving out of these data what may be merely 
local and accidental, they certainly indicate a pressure operating 
in an E.SE. to W.NW. direction, and producing a series of folds 
at right angles to that direction, besides another pressure operat¬ 
ing in a transverse direction, that is, in a NE. and S\\ ., or more 
probably in a N.NE. and S.SW. direction, and producing another 
