Limestone Belts of Westchester County, N. Y. 918 
Going north from the vicinity of Cruger’s Station along sec- 
tion 1, instead of section 8, the rocks change from the coarse 
dioryte at the end of the section to fine-grained ; and then, in 
three-fourths of a mile, the rock is well-characterized noryte. 
Moreover the noryte contains a band of magnetite, exposed in 
a working (near Mrs. Murden’s) with which occur garnet and 
fibrolite. The band is bedded, the magnetite is chloritic, and 
the assemblage of minerals is the same that occurs in the soda- 
granite, as well as the schist west of Cruger’s. Fibrolite is 
found also with the magnetite of Eastern Cortland. 
The noryte and chrysolitic rocks are thus apparently in the 
same category with the soda-granite and quartz-dioryte. 
Stony Point.—This conclusion is further sustained by the 
facts to be observed at Stony Point, and these facts come into 
this place although the locality is on the west side of the Hud- 
son; for the Cruger schists make the south border of the region 
precisely as near Cruger’s, and have the same strike and dip, 
showing a like relation to the Cruger limestone belt and _prov- 
ing its former extension across the river. For further compar- 
ison between the geological facts of the east and west sides of 
the river, it is to be observed that the succession of rocks west 
of Cruger’s, on the line going northward, from the river on the 
south side of the point to the north side of Montrose Point, is 
(1) limestone; (2) schist; (3) soda-granite (with some included 
dioryte) ; (4) chrysolite rocks; (5) (on Northern Montrose Point) 
noryte and chrysolitic rocks in complicated combination. 
e same is the order on Stony Point, except that the lime- 
stone is not in sight (no doubt because submerged); it is: (2) 
schists; (8) soda-granite ; (4) chrysolite rocks, followed by (5) 
noryte and chrysolite rocks combined. he dioryte of the 
Cruger soda-granite is not represented there.) On the map, x 
is the area of the schists; y, the soda-granite; z, the chrysolitic 
rocks, and 2’ the latter with noryte. But besides being the same 
in order, there is evidence that the soda-granite succeeds the 
schist along a plane of bedding of the schists, as if conformable. 
This is apparent at the junction of the two on the east-north- 
east shore of the point. Included beds of schist occur, but 
the covering of earth prevents a determination of their direc- 
tion. Further, the chrysolitic rocks succeed to the soda-gran- 
ite along a plane parallel to the same plane of bedding, as is 
seen just west of the boat-pier near the middle of the north- 
ern shore. Besides these facts, there are included beds of fine- 
grained hornblende rock (schist ?) and other kinds in the noryte 
and chrysolitic rocks, which are in general conformable to the 
same plane, or about N. 70° E. in strike, with a dip of 75° to 80° 
to the northward. 
* 
