36 Geology, ce. of the Conneeticut. 
and imperfect characters prevented my putting it down asa 
distinct rock. The stage road from Greenfield to Brattle- 
rough passes over it in the southern part of Guilford. At 
the same place occurs well characterized paige ie 3 but 
not constituting any extensive range. 
One mile south of this spot, another rock occurs, whee an 
observer, at first sight, would pronounce to be granite, It 
is unstratified* and has the color of granite; but seem 
be made up chiefly of quartz with a little mica interspersed. 
it seems to be an aggregate to which no particular name has 
as yet been applied; although the proportion of mica is so 
small that it might almost be called quartz ee It ap- 
pears to form a large bed in argillite, or talco-argillite. 
he strata of argillite, both in Connecticut ont Vermont, 
run in a direction nearly N. E. and S. W. and are highly in- 
clined, generally varying but little from perpendicular. They 
are undoubtedly primitive—that is, the evidence of this is as 
great asin regard to the mica slate; both being highly inclined, 
and destitute of organic remains. Indeed, Bakewell, who has 
transferred argillite to the transition class, sé mica 
- 3 
ge gs yt ere 
latter withrocks oft 
whether mica slate should not also have Wine Rubae to 
the same class.” (Geology p. 83.) Do we not here see to 
what temptations the system maker is exposed, when pres- 
sed with difficulties? However, as Professor Kidd remarks, 
*¢ By stratification we understand the divisions of a mass of rocks into 
many pase: portions whose Mean 2 bay Hon Pes exceed ihete 22 
ess.’ 9, p- 
ic tA soa & Te J, ee oe a 
te 2 
If so, let us hear no more of Pantoainpol 8 pete basin shape, 
a aped stratification tgcsahgs Bhd Geology, Essay 1. 
I w d beg liberty to enqui ire, whether some of these difficulties might 
not te ait 1 by defining stratification (o be the divisi mass of rock 
into many parallel or concentric ions? But a all, this, ikea 
other definitions in natural history, is only an approximation to the truth 
ne: if mathematical exactness be essential, we sabe never yet seen any rock 
ivi chet either parallel or concentric, Bakewell’s abr 
¢ appt p. 21.) between “ithe structure which is caused by 
cys erys niillidation, and mechanical depositions,’? would saay 4 give 
relief to some lties in regard to stratification, were ge 
agreed have a structure caused by chemical agency and what 
ones are mechanical deposites. But are arent on this point, as 18 
Sraent fr rom the very example he ie weiss to iostrate his fond ery ice 
ir _ 
sh Saieponition. 
Se ETN 
