440 oJ. D. Dana—Taconice Rocks and Stratigraphy. 
jy tof inch. Interlaminations of quartz generally make more 
than a fourth of the thickness. Garnets are abundant, 4, to 4 
inch. Staurolite crystals abundant in some portions, 4 to + 
inch long and less. Orthoclase sparingly present. Minute 
tourmalines of occasional occurrence both in the quartz seams 
and the micaceous portion. 
4. Three miles east of Mt. Washington on the eastern border of 
7 
a normal mica schist. 
B. Section through the northern part of Mt. Washington from 
Copake through Sheffield commencing at the west. 
1. In Copake, New York.—The schist of the small ridges 
north of Winchell Mountain is a very thin fissile hydromic@ 
(or sericite) schist, like the Winchell slate, but of finer grap: 
looks like a smooth, glossy roofing slate. Contains no garnets. 
2. West side of Mount Washington, near Copake Furnace. 
The rock is a greenish or chloritic hydromica schist, with also 
mica schist. It is sparingly garnetiferous; without staurolites. 
8. Hast side of Mount Washington in Shefiield.—The schist 1s 
like that on the west side, but it is coarser, and a larger part 18 
rue mica schist. It contains garnets, but no staurolites were 
ound. Minute tourmalines occur in it. 
4. Th n near the village of Shef- 
hi . ish mica 
sembles the schist of the southern part of the east side of ™ 
_ Washington in its degree of fineness and in its staurolites, 
a 
