TUB SAVOY SCHIST. 159 



places by A-eins and irreg'ular {)atclies of coarse frranite. It sometimes 

 abounds in coarse cyanite blades. 



In Sodom Mountain, in East Granville, the same rock prevails. Unim- 

 portant l)ands of liornblende-scliist occur, and a bed of the pale-green cal- 

 careous pyroxenite, very probably an altered impure limestone bed, was 

 observed by President Hitchcock' and catalogued as augitic mica-slate. 

 The rock here very closely resembles the Andierst riisty feldspathic mica- 

 schist. 



Northward through Blandford the rock gradually ceases to contain 

 biotite and feldspar as constant and important constituents, becomes gi'ay 

 and more siliceous, and the nuiscovite is generally hydrated. It is much 

 corrugated in this area, and doubtless contains many subordinate folds and 

 great flutings, which could in some cases be traced for considerable dis- 

 tances, and to which I devoted much lal)or, l)ut without reaching results 

 which could be entered upon the map. 



If from Granville we go north through Russell, east of Blandford, and 

 thus through the eastern half of the broad expansion of the formation, we 

 tind that the Granville feldspathic facies persists much farther north and 

 would seem to belong to the lower portion of the series here discussed. 

 Northward it is, nearly to the Westfield River, a coarse, rusty muscovite- 

 schist, often biotitic, often a little feldspathic, and, indeed, may be called a 

 coarse membranous gneiss, the continuous folia or membranes of mica being 

 separated by thick sheets and lenses of quartz with a little feldspar. 



As before (see p. 85), a somewhat detailed description is given of the 

 development of the series along the Westfield River, which in Chester runs 

 down across this series, making an acute angle witli the strike, and then, 

 crossing the southward prolongation of the Conway mica-schist, again 

 enters this formation and runs for a long distance through Huntington 

 and Russell, across the head of the eastern anticline. 



In Chester the rock is already a chloritic sericite-schist, of a type which 

 continues a long way north; flat, thin-fissile into plates 10-15™'" thick, with 

 the micaceous minerals concentrated mostly on the lamination planes; 

 uniformly light-gray with a shade of green from the presence of scales 

 of chlorite mixed with the muscovite, and these can be detected with the 

 microscope when they are not visible to the eye; at other places this 



'No. 2113, Catalogue of State Collection; Geology of Massachusetts, 1841. p. 814. 



