MUSEUM OF COMPARATIVE ZOOLOGY. 23 
bottom of the slope, in the Shaker Valley, the mica schist contains a 
band of limestone, made up of two adjacent layers of different varieties 
of that rock, The upper layer is composed of thin-flaggy, crystalline 
limestone, of a gray color, without traces of fossils, and about seventy 
feet in thickness. The lower is composed of compact, crystalline lime- 
stone, without stratification, gray upon the fresh surface, and weather- 
ing buff. It is interlaced on the weathered surface with a network 
of fine fissures, and has a thickness of about thirty feet. 
On the western slope of the spur called Merriman’s Mount, near its 
summit, is an exposure of rock like that on Fry’s Hill, and in the deep 
ravine between Merriman’s Mount and Flat Rock, are exposures of rock 
which is very similar to that just mentioned, except that it is more 
schistose. On the western slope of Dupey’s Mount, near its summit, is 
an exposure of rock resembling very closely that found upon Douglas 
Knob, 
The eastern slope of the Richmond Range is composed of fine-grained, 
friable, argillaceous mica schist, usually containing layers of white 
quartz from one eighth of an inch to one inch in thickness. These 
layers are separated by irregular intervals, and are always more or less 
contorted, 
The bottom of the Richmond Valley is occupied by a broad belt of 
limestone averaging two miles in width. This limestone ‘is st ratified, 
though not in all cases distinctly, is fine to coarse grained, highly crys- 
talline, and without traces of fossils. The color varies from gray to 
white. 
LENOX RANGE AND LENOX AND STOCKBRIDGE VALLEY. 
Upon all parts of the Lenox Range, within the region studied, the 
bed-rock consists of ferruginous mica schist, bearing layers of quartz in 
even greater abundance than either the Canaan and Lebanon or the 
Richmond Range. 
The Lenox and Stockbridge Valley, lying to the eastward of the 
Lenox Range, is occupied by limestone, which very closely resembles 
that of the Richmond Valiey. 
Some further remarks on the stratigraphical geology may be found in 
Note C, page 40. 
