40 TACOISTIC PHYS -.KAPHY. 
to prevent atmospheric erosion from making any considerable hi 
. before their completion. If these movements were slow, 
estimate would ! - tnewhat reduced. In any c a at least '■'> 
of strata have been removed from it- summit. Fig. _. 
shows the mass rising 1.100 feet above the Housatonic Valley 
left, thus repn - ts but i y '.' per cent of the original thick:. -- 
liments deposited then 
SYN< J.INWL HILLS. 
3 
1 
The well-known tendency in such a region toward the preserval 
of the - - of the upper and harder beds (as in th< - ( I 
Mountain ), rather than of the anticlines of the same, r- - 
mentioned. The synclinorial character of the Taconi B 
shown in PL V, A. ited on a small scale in mam I. R _ 
and Sugar Loaf mountains in the Greylock m ss, I Tom Ball 
West Stockbridge, are excellent examples 3eep.l9). Thes - cli 
vary greatly in longitudinal and lateral structure. II - . M i 
:i iu Pawlet (1,919 . shown in PL VI. fi. from a ph< 
taken several years ago by C. D. Walcott, Director of the I 
States Geological Survey, is the tral horizontal 
syncline of schist, c steep easterly dipping cl< 
vertical east-west joint planes. The eastern slope of the i. - 
largely determined by clea _ . and the cliffs at the so \. 
joints, but oth< there is little relation b en it- struct 
its form. 
5SE4 1 ED HILLS. 
Erosion has attacked the schist masses on all sides, 
the dissection has proceeded so far as to leave mere spid< 
forms, such as Grass, Bear, and Dorset mountains in Benn _ 
County, Woodlawn and Tinmouth mountains jjj Rutland County, 
shown on the relief map. [nsuchmas* spurn still corre* 
to the strike of the bedding or the jointing, but i a 1 the 
are without structural significance. Marr calls such hills dis 
moeLs. 
This pr< of dissection may occur on one or several - 
mass. J' tion chiefly on one side is shown in the Taconic Ran 
south oi tHe Vermont-Massachusetts line, along the New York b 
der, and. indeed, is a general feature of that range. The ar« 
flowing streams take their rise well on t)j<- eastern edge of 
accordance with the general process of stream erosion in the regi 
i ■ tb Ann. Bept. f & GeoL Survey, pt. _'. 1900, PL II. 
rr. .1. K.. The origin of moels, am] their buI tion : CJeog. Jon 
17. 1901, pp. 63- 69. 
