62 Geology, &e. of the Connecticué. 
the greenstone in the vicinity very much resemble basalt. 
The sandstone imbedded is that fine-grained argillaceous 
variety next to be mentioned. 3. A red, very fissile Ther 
argillaccous sandstone. Itgenerall ally 
my. where, frequently lying i enc xh 
diatel th vith ma 
ny other varieties of feck hereafter to be mentioned. 4. A 
Gray Micaceous Sandstone Slate, not argillaceous, grit coarse, 
very fissile, layers even, some varieties much re sembling 
mica slate, others containing vegetable remains. 5. A simi- 
Jar slate ; but much finer, harderand the layers undulating. 6. 
A slate approaching in appearance to shale, butvery silicious, 
harder and vey. fissile, layers straight, surface not smooth, 
dark gray. 7. Shale, generally a em eh lig aN frequent- 
ly micaceous with and without I chthyolites. 8. A slaty rock of 
the aspect of shale, and sometimes each resembling coal, 
dividing into numerous small pieces of irregular form, and 
disintegrating when exposed to the air and moisture. 
the falls in Gill. 9. A slate made up chiefly of indicated 
clay, sometimes micaceous, easily scratched by the finger nail, 
liable to disintegration. Falls in Gill, and cave in Sunder- 
land, not abundant. 10. 4 fragmented rock, the fragments 
chiefly a reddish brown quartz, appearing as if burnt, ce- 
ment silicious and apparently ferruginous, rock very hard, 
and appearing almost like porphyry, unstratified, not abun- 
dant. In Gill. 11. Gray pudding-stone, distinctly stratifi- 
ed, layers from six inches to a foot thick. Imbedded nod- 
ules, quartz, felspar and mica sae .rarely more than an inch 
in diameter, but very abundant, cement same minerals com- 
minuted, island i in the falls at "Gil. 12. Reddish stratified 
pudding-stone, coarser than the last, and scarcely differing 
from the conglomerate accompanying the old red sandstone. 
Mount Toby, Belchertown and Granby. 13. Very coarse 
dark gray pudding-stone, scarcely stratified. Imbedded 
masses often very large, even a foot in diameter, and very 
abundant, consisting chiefly of mica slate, argillite and chlo- 
rite slate; but containing quartz, hornblende, talcose slate, 
and sometimes granite, cement the same, rocks comminuted. 
Gill, Montague, Mount Toby, and Durham. Most of the 
preceding oe are often found alternating with one anoth- 
er. 14. 4 imperfect limestone, very silicious, in beds 
in sandstone fe not fetid, not abundant, Gill. 15. Fetid 
