226 GEOLOGY OF OLD HAMPSHIRE COUNTY, MASS. 



biotite-gneisses («); then, at and just east of East Pelham, the actinolite 

 quartzite ; then a second narrow band of the biotite-gneiss («) ; then a broad 

 band of the musco\'ite- (h) and hornblende- (rf) schist here discussed; and 

 finally, at top, a recurrence of the true iDiotite-gneiss (a)} 



On the east the series dips with so small an angle and so regularly 

 eastward, and the members can be seen passing under each other so 

 normally, that it is very difficult to avoid the conclusion that they are in 

 regular succession and that all are a part of the Monson gneiss series, and 

 this was at first my opinion. On the other hand, the series bears in several 

 particulars strong resemblance to the mica-schists and amphibolite as devel- 

 oped to the east in New Salem. 



As one goes down the long hill east from Pelham Center, after reach- 

 ing the first road turning south, one finds many outcrops of a thin-fissile, 

 quartzose two-mica-gneiss, which varies from a thin-fissile quartzite with 

 much coarse muscovite spread upon the rather distant foliation faces to a 

 fissile biotite-gneiss with muscovite distributed as above, or, finally, a shin- 

 ing-white, purely muscovite-gneiss, or — and this last comes to be the 

 jsrevailing rock going either north or south — a very coarse, rather rusty 

 muscovite-biotite-gneiss or schist. This agi'ees closely with the basal 

 beds (b) of the other section. Slight traces of the hornblendic rock (d) 

 occur down this slope, but northward, across Purgee's brook, a heavy bed 

 of the hornblendic rock ((I) ap^jears in the bluff" north of D. Shore's house. 



The series can be followed from this section south 5 miles to a point 

 west of Enfield Center and north 5 miles across Pelham and Shutesbury 

 into Wendell, maintaining a width of about a mile, which, from the low 

 dip and its position on a hillside sloping with the dip, does not represent a 

 great thickness In all this distance the rock is everywhere cut by great 

 granite dikes or is greatly impregnated with granite, so that many beds 

 seem like purely granitic (pegmatiticj material made schistose by pressure. 



Above the amphibolite (cl) in the above section and near D. Shore's house 

 a coarse mica-schist full of large garnets represents the Savoy schist (e), and 

 following the river road north from this point any section carried across the 

 hills to the west would give the same succession until, in the extreme north- 

 east corner of Pelham, one finds these upper schists dipping apparently 

 beneath the heavy-bedded Monson gneiss, but separated from it, I suppose, 



'The italic letters refer to sections given on pp. 213-214. 



