THE CONWAY SCHISTS. 187 



from 1,000 to 2,000 gross of scytlio stones per annum. A new quarry, 

 which is still worked, was opened in 1888 in Ciunmiuo-tou.^ Hitchcock" 

 reports in 1832 that mica-shite is <[uarricd in hirge quantities in Norwich 

 (now Hunting-ton). 



The most remarkable band of this sort is encountered on tlie river road 

 from Shelburne to Greenfield. The road where it runs farthest south, in 

 Deei"field, crosses the band, which is here 300 feet wide, and its eastern 

 outcrop is near a small schoolhouse. The next road north, which enters 

 Shelburne from the northwest corner of Deerfield, crosses the same band 

 with the same width, and it seems to make the whole flank of Arthurs Seat. 

 It is a flat-fissile, fine-grained, light-gray, micaceous (juartzite with a- shade 

 of red, which changes on weathering to pale green, and which recalls the 

 sericite-schist. East of it, on the last-mentioned road, is a black garnet- 

 bearing and biotite-bearing schist, exactly like the upper bed of the Con- 

 way schist at contact on the Leyden argillite farther north. 



Another interesting outcrop of the whetstone-schist is the band in 

 Whately between the great hornblende band and the argillite. This is in 

 places .somewhat more micaceous and carries four thin limestone beds. 

 The same bed comes out through the conglomerate of Mount Tobv at 

 Whitmores Feny, in Sunderland. (See page 361.) 



PETROGRAPHICAI, DESCRIPTION. 



Opposite school on road to Clarke tourmaline ledr/e, Chesterfield. Under 

 the microscope the whetstone is a mass of angular quartz gi-ains, manifestly 

 clastic, with distant, regularly disseminated flakes of biotite with irregular 

 outlines conditioned by the surrounding quai'tz grains. 



Pale-green muscovite occurs in elongate scales. There is little coaly 

 matter and the magnet shows no magnetite. A fcAv stout elongated prisms 

 with cross cleavage and rounded ends ma}^ be andalusite. 



Cunimiiigton, B. Shaiv\s qHairij. Best quarry stone. Like the above, 

 but of darker color, finer, and more even gi-aiued. Under the microscope: 

 clastic quartz, more biotite, less muscovite, and nuich more coaly matter; 

 no magnetite. 



' L. S. Griswold, Whetstones and the uovaculites of Arkansas : Geol. Survey of Arkansas, 1892, 

 pp. 24, 73. 



-Geol. Mass., 1832, p. 23. 



