368 J. D. Dana— Geological Relations of the 
conformable with it, common gneissoid mica schist, and in the 
schist there are thin beds of limestone. 
e Verplanck belt, No. 28, has the normal northeast trend, 
the strike averaging N. 35° E. (dip 60°-70° E.). But toward 
the Point there is much variation from this, the strike a third 
of a mile from the Point changing from N. 44° E. to N. 63° 
W., and near the river, south of the more northern brickyard, 
from N. 50° EK. to N. 74° E., the dip 40°-70° E. 
Areas 29, 80 and 80 A.—Number 29, another of the north- 
ern belts having a northeast course, extends up Sprout Brook 
Valley or Canopus Hollow, into the Archzan area of Putnam 
County. Its length is nearly five miles. It adjoins quartzyte 
conformably at the mouth of the brook (p. 214) with the strike 
N. 47°-54° E., and dip 60°-70° E.; near the crossing from 
Peekskill to Annsville, a hydromica slate lies between it and 
the quartzyte ; and just below Annsville, near the river, it lies 
against Archean hornblendic gneiss. The most northern outcrop 
I have found is situated to the west of the south end of Osca- 
wana Lake. The limestone has been already described as for 
the most part but slightly crystalline, especially in its more 
southern portion. Two-thirds of a mile north of the Putnam 
County line, under a bridge over the stream, quartzyte in beds 
lies against the limestone; and above this at some of the out- 
wi the limestone is interstratified with mica schist. 
anopus Hollow belt appears to be continued south- 
westward, across Hudson River, in the limestone of Tompkins 
Cove at the foot of the Archean Highlands. This limestone 
forms a prominent bluff facing the water and has long been 
worked for lime. It is in its eastern part a whitish, compact, 
fine-grained, crystalline limestone, but to the westward a 
gray, uncrystalline rock. The area extends south-southeast 
nearly to Stony Point village, about two miles, and dis- 
appears because beyond this it is overlaid by the Triassic 
Red sandstone. The average strike is N. 20° E., and the dip 
35° to 60° EH. Just southwest of Stony Point it is covered by 
a grayish to reddish limestone conglomerate made up of peb- 
bles and rounded stones which are worn fragments of the lime- 
stone bed; and: this conglomerate is referred by Professor G. 
H. Cook to the Triassic. 
Although the average strike of the beds of the limestone is 
as above stated, there are great variations at the Cove, they 
becoming even east-and-west in some parts. At the Cove the 
limestone has on its western side, a blackish, fragile, partly 
graphitic slate or hydromica schist (called talcose slate by 
Mather), resembling that of Canopus Hollow north of Peekskill, 
which, half a mile south, changes to a quartzose rock, partly 
feldspathic, resembling the granitoid quartzyte of Peekskill. 
