250 GEOLOGY OF OLD HAMPSHIRE COUXTY. MASS. 



iuto qnartzite and quartzose sericiteseliist, with palegreeu hydrated luuscovite and 

 large distant garnets; 3,791 feet. 



/'. Conway schist. A coiixse, lead-gray, barren mica-schist occupies about half 

 the thickness of this bed and is succeeded above by a corrugated mica-schist of tine 

 grain, very dark, from the large amount of graphite in it, and abounding in small 

 garnets (x P) and dark red-brown biotite, set transversely to the bedding; 1,188 feet. 



The similarity ot" this series to the correspoudiug one across the Con- 

 necticut A'allev is striking. Each snbdi\-isiou between the Becket gneiss 

 and the Levden argilhte is represented, tliough with diminished thickness. 

 The Savov schist (<■) is well exposed in the fix'st cutting west of the Palmer 

 station on the Boston and Albany Railroad. Here there is trace. a]iparently, 

 of a coiTUgation of the qnartzite, upon which the vertical foliation may be 

 superinduced as a secondary structure. This would Tlimw doubt upon the 

 thickness o-iven above. Following the Somers tm-npike a mile and a half 

 west from the south end of State-line Pond, in Connecticut, at the south end 

 of the long ridge of Peaked Mountain one comes upon the finest quailz- 

 eoufflomerate in the Rowe schist. It is in a great ridge on the north side 

 of the road, at a ruined house northwest of the schoolhouse. 



The mica-schist (/'), the central portion of which agrees sti'ikiugly with 

 the Conway sdiists clear across the town, is best studied where the road 

 from Palmer to Hampden crosses it, a mile northwest of Flynt's quarry. 

 The uppermost beds are so fine-grained and plumbaginous that they recall 

 the Levden argillite, and this is exactly the horizon at which it should 

 occur. 



If the section be continued westwai'd it repeats itself exactly in inverse 

 order, though here the amphibolite is very generally porphyritic in appear- 

 ance — a structm-e which is due usually to the absence of hornblende from 

 small spots regularly disseminated, so that the whole granular groimdmass 

 shows: but many bowldei*s of the rock found in the southwest corner of 

 Monson are of fine, porphyritic diorite-schist with tiesh, i)Oorly cleaving 

 feldspars in close-set. rounded grains. 



It seems to me probable that a naiTOw fi-agment of rocks of this series 

 starts east of Flynt's quarry, neai- the "rock house," and extends north 

 through Bunyan Mountain, either faulted down into the center of the anti- 

 cline or brought there by a subordinate downward fold of the schist which 

 formerly mantled over the gneiss. It was of too limited extent to find place 

 upon the map. 



