J.D. Dana—Taconic Rocks and Stratigraphy. 21 
that which extends by Millerton, and then, after an interrup- 
tion, bends westward, north of the Putnam County Archean, to 
Fishkill on the Hudson. 
The elevated region of Mt. Washington has already been 
shown to be a synclinal of schist with underlying limestone. 
Beyond I present further details relating to this mountain ; an 
also evidence that the same structure is the common one 
‘mong the subordinate ridges east and west of the Taconic 
Sale In giving this evidence I commence with the town of 
Isbury, ; 
a. Northeast of the railroad station of Limerock, a pie 
pee, consisting chiefly of limestone, faces the river. TI : 
buf is the southeast front of what is called Gallows Hill, 
‘ae rises from the limestone plain east and south of it toa 
“ight by estimate of about 500 feet. 
Gallows Hill, as the map shows, is the common head of ay 
Tidges of schist, one of which stretches from it northwestward, 
pe other south westward.* Each consists, like other Salis- 
bury ridges, and Mt. Washington in part, of a Sci he co 
7st, much of which is garnetiferous and staurolitic. eing 
thus alike in rocks and hence one in origin, we shou t 
aay look for evidences of wrenching and displacements In 
ows Hill, their common head. 
Uch evidences exist in isolated interior patches and feet 
. limestone, and in other features. Although but a mt ” 
ein area, four limestone patches mark the courses fhe 
wany faults; one at each 2 and 2’, and Dengan pote Be Ses 
of : hi 3. Besides these, other faults are indicated by 
schist. | 
_ The blu southeast front of Gallows Hill, referred . is 
“nsists of limestone for about 300 feet, and above this 
ety southwestward direction is probably a consequence of er nag a 
= that an Archean area exists to the south and southeas' iro 
lien ot Sharon, Cornwall and Kent, which was a resistt mass 
t It fe erates of the later rocks took place. 
near the house of Mr. L. D. win 
