252 J. D. Dana on the Green Mountain Quartaite. 
eastward. This gneiss is, therefore, conformable to the schist, and 
an inferior bed of the Taconte series. 
2. Poughquag and more western limestones.—West of this 
gneiss, about Poughquag, there is a great limestone formation, 
which, judging from the width of the area and its dip, 1s as 
thick as that at et 2 It has the same strike with that 
rock, or N. 30°-40° E., ‘with the dip also about the same, or 
40° to 60° to ~ southeastward. This range of limestone 
extends northward, and although interrupted for some distance, 
appears to be the same with that which Percival and Mather 
lay down as passing through eastern Washington, western 
Amenia, Boston Corners, by the east side of Winchell’s Mount- 
ain (a ridge just southwest of Boston Corners), to Copake on 
the east side of Ancram Creek valley. It is distinct, according 
to Mather, from another limestone range in Copake. which lies 
on the west of Ancram Creek valley, and stretches south on the 
west of Winchell’s Mountain to Pine Plains and Stissing, and 
thence, by Wappinger Creek valley, to Barnegat on the Hud- 
son—a range of limestone called by Mather the Barnegat lime- 
stone. Mather speaks of another intermediate line, extending 
from Stamford, through Washington, and half a mile east of 
Verbank; and this line appears again at Arthursburg and 
Beekman, es continues down Fishkill Creek to Matteawan on 
the Hndso 
Calling ae Pawling (or a eae eco No. I, the 
Poughquag and eastern Copake is No. IT; the Arthursburg 
and Fishiail Creek, No. III; the western Cee Pine Plains, 
Stissing and Barnegat ( ‘Barnegat limestone), No. I 
In an excursion to Poughkeepsie, we passed No. III at 
Arthursburg, ten miles from Poughkeepsie, and No. IV, or 
the Barnegat limestone, at Manchester, three miles from Pough- 
eepsie. Barnegat is a place on the Hudson, about four miles 
the stat so that the uniform easterly dip is no proof t - 
* Mather has an meine error in his statements about this band and the first 
of the bands here mentioned; for he makes the first to extend to Fishkill, and 
the one last inline: to cross that and extend to Poughquag. The great bands 
of limestone are not continuous lines, owing probably to the irregular manner in 
which the rocks have been faulted and the subjacent slates uplifted; but the parts 
of each have a nearly common direction. The region requires a careful survey: 
i tr there are extensive beds also of compact slate-rock or argilla- 
mn 
