610 
GEOLOGY OF THE FIRST DISTRICT. 
N20°E 
Eastward and 
westward 
Eastward 60° to 70° , 
Vertical. 
Southward. 
do 60° to 8 
do 70°.,.. 
do 70°.... 
WSW 20° to 
Eastward and west¬ 
ward 
Nearly vertical . 
Limestone lying on granite Thirty rods eastward of the preceding. 
.A few rods north of the last. 
ss, mica slate, augite,'Murray mountain at Sparta. This transverse stra- 
;. I tification is opposite the great trap dyke, on the 
I west side of the bay, near Verdrietje hook. 
Limestone and mixtures of At the old “silver mine” on the shore between the 
this and augite, magnetic State prison and Singsing landing, 
pyrites, etc. 
Talcy slate.On the postroad near Peekskill creek, and Blue-rock 
point. 
Slaty limestone.South of Annville, across the marsh. 
Talcy slate.Gallows hill. 
Various rocks.Roya hook to Peekskill. Vide PI. 14, fig. 4. 
Hornblendic,sometimesstra- Between Peekskill and point below, 
tified I 
Various rocks.Synclinal and anticlinal axis, between Verplanck and 
I the Croton. Vide PI. 14, fig. 7. 
Gneiss and hornblendic Ridge north and northwest of Tarrytown and Mrs. 
gneiss, with veins andi Beckman’s quarry, 
beds of granite 
Gneiss, hornblendic gneiss,'Along the shore, in numerous localities, from Tarry- 
40 W 80° to 90° .. W 80° to 90° 
NNE . 
N 40° W. 
ESE 30° to 80°.1 
N 50° E 50°.' 
SSE 60°.( 
NNE in some 
places, NNW 
in others 
NR. 
Vertical and variable 
in some places ENE 
30° 
Nearly vertical strata . 
Eastward 60° to 90° .. 
Northeasterly .. 
NW . 
' N3 0° E. 
NNE . 
ESE 30° to 80° . 
ESE . 
: NNE . 
Westward 40° to 60° 1 
ESE 70° to 85° ....... 
NNE"* . 
N 30° W . 
I N 30° E. 
Hornblendic gneiss., 
PUTNAM COUNTY. 
Generally throughout the county, with some local ex¬ 
ceptions. 
(with veins and beds of 
granite, magnetic iron 
ore,) limestone, etc. 
On the shore of the Hudson near Peekskill, 
courses 2 and 3, on table, p. 544. 
and hornblendic gneiss 
Iranite gneiss and horr 
blendic gneiss 
Hornblendic gneiss, granite 
i, etc. 
Serpentine,limestone,augite, 
pyritous gneiss, etc. 
Gneissoid and hornblendic 
rock 
Gneiss of various qualities . 
Limestone, containing au¬ 
gite, coccolite and brucite, 
bounded by gneiss 
Gneiss, containing pyrites, 
and traversed in north¬ 
west and southeast direc¬ 
tion by quartz veins 
Gneiss and hornblendic 
gneiss 
Serpentine, anthophyllite 
talc, etc., in gneiss 
White and grey limestone 
containing tremolite 
Point about west of a small island near the left bank 
of the Hudson, in the Horserace, between Peeks¬ 
kill and Anthony’s-nose point. Vide table, on 
page 544; No. 9. 
Vide table, on page 544: No. 14. 
do 
do 
do 
do 
do 
do 
No. 15. 
Two rocky islands, above Anthony’s-nose point, in 
front of the salt marsh on the left bank of the 
Hudson. Vide No. 21, p. 545. 
On the promontory on which the “ old silver mine ” 
is located. Vide No. 23 to 28, on page 545. 
At the mine of arsenical iron, three miles northwest 
of Putnam court-house. Carmel, near the bed of 
black serpentine and diallage. 
Putnam court-house to three miles northwest and 
north and northeast, is the usual strike and dip. 
One and a half mile south of Putnam court-house, 
at two old mine holes. 
At the locality where a lead mine is said to have been 
found many years ago and lost. Near the Croton 
river, south of Simewog mountain, on Jedediah 
Wood’s farm. 
On Simewog hill or mountain, at and near the iron 
mine. 
At the “ soapstone bed,” near Peckville, one-half mile 
northeast. 
Two and a half miles southwest of Patterson. 
