250 J. D. Dana on the Green Mountain Quarizite, 
Art. XXXI—Green Mountain Geology. On the Quartzite; by 
JAMES D. Dana. 
(Continued from page 186). 
2. QUARTZITE OF PouagHquaGc, Durcuess Co., N. Y. 
THE town of Poughquag is situated on the road from Paw- 
ling (a village on the Harlem railroad) to Poughkeepsie, and is 
about five and a half miles northwest of Pawling,* near the 
parallel of 41° 38’. 
n order to arrive at the true relations of the Poughquag 
quartzite, the position and age of the other rocks of the region 
must be considered. 
1. Taconic rocks.—As has been stated (p. 184 of this volume) 
the Stockbridge limestone extends from Canaan, west of south, 
through Dover to Pawling. It continues beyond this latter 
place southward along the valley, for seven or eight miles, 
where both valley and limestone narrow out. 
n the region of Pawling the limestone dips to the eastward 
at_a large angle, between 55° and 70°; and in the two anda 
half miles of breadth there must be a thickness of at least 
3,000 feet, perhaps of 5,000 feet. Supposing that there are no 
folds—none were detected by us—the thickness would 
much greater than this. 
est of the Pawling limestone region to Poughkeepsie on 
the Hudson,—a distance of twenty-one miles, directly across 
the strikes—the rocks all the way, with some small local excep- 
tions, dip easterly (to the south of east) the observations of Mr. 
miles ¢ of New Milford (on the Housatonic), or twenty-seven 
miles from Poughkeepsie. t 
Leaving Pawling on the way to Poughquag, going pore 
ward, you pass from the Stockbridge limestone (of Pawling) 
* The distances given in this paper are air-line, not road-line, distances. ¢ this 
+ I am not yet able to say which of the patches of limestone to the south 0 is 
apparent termination is a continuation of the Stockbridge limestone. or that any 
s 
Azoic Hig dges on the west and south, alluded to beyond. The @ ge 
Williamsburg and along the Harlem ruilroad are probably continuations, not Se 
Stockbridge band, but of otler bands of limestone lying fa the 
of Kent and Ne d (see Percival’s map, in his Geological Report); 
rt); whi 
by the way, aco rding to sections made by Mr. Gardner and myself, in the line . 
f a synclin 
, are opposite sides of a i al, an ; 
schists, overlie the Stockbridge limestone, unless 
superincumbent gneisses and 
great fault intervenes. 
© position of the synclinal axis referred to in the preceding note. 
