MUSEUM OF COMPARAHVE 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 stratified, 

 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 Valley. 



Some further remarks on the stratigraphical geology may be found in 

 Note C, page 40. 



