Limestone Belts of Westchester County, N. Y. 211 
over 10,000 feet of these upturned rocks have been removed 
by erosion, and noting also the number of the bands and their 
parallelism to the schist, and the effect of pressure to keep them 
in place, the assumption can be no exaggeration. 
15. 
Birch Cc D E 
Since it is obviously impossible that the inclusions taken in 
and carried up by rocks erupted through deep fissures should 
be beds of schist 100 to 200 feet long, and a series of such 
beds separated by the fused rock retaining together their par- 
allel position, we have to admit that these indications of bed- 
ding are of wnobliterated bedding. The rest of the upturned 
strata were fused or at least softened; these portions of beds 
were not fused, though flexed and variously displaced. 
here is reason for the resistance to fusion in the mineral 
nature of the beds; for quartz, staurolite, fibrolite, magnetite, 
are infusible minerals; muscovite and biotite are but slightly 
fusible on thin edges; and orthoclase fuses with great difficulty, 
much greater than the other feldspars, oligoclase, labradorite 
and albite. 
Thus the study of the phenomena of contact becomes in this 
region a study of “‘inclusions;’’ and the larger of the inclu- 
sions turn out to be beds of schist, conformable to the schist. 
Weseem to be thus forced to the conclusion that the soda- 
granite and the included dioryte were once parts of the same 
sedimentary strata with the schist, and that all, with the Cru- 
ger limestone, were once a continuous stratified formation; 
and that the plasticity given to the granite-making or dioryte- 
making portions, because of the heat, occasioned the excep- 
tional geological features of the region. 
e region of Cruger’s Point is continued northward into 
that of Montrose Point; the latter is characterized, as has been 
stated, by chrysolitic rocks for its southern three-fourths, and 
by noryte with chrysolitic rock for the other fourth; and 
through the facts there as well as elsewhere afforded, the evi- 
dence from inclusions is made to extend also to these other 
rocks. ~ With the chrysolitic pyroxenyte and chrysolitic horn- 
blendyte, there is also hornblendyte which is not chrysolitic, 
but more or less augitic and containing some triclinic feldspar. 
On the south side of Montrose Point facing Cruger’s Point (or 
the brick-yard between the two), in the chrysolitic rock, there 
is what looks like a vein or dike two to four inches wide, 
