eS gS ee Ae Se MONT IRE ee Yale WC aE eae age gee te lO oe? 
abe Se ee eS gs 
Fal 
Great Synclinal in the Taconic Range. 273 
ore-pit (ore-pit c) 400 yards south, the schist fails, and only 
drift material covers the limestone and ore. 
The ore-pits that have been opened about the base of Mt. 
Washington, fourteen in number, are situated near the junction 
of the limestone and schist; and, in view of the facts that have 
been mentioned, this means—near where the limestone emerges 
Jrom beneath the schist. I here add that the iron ore (dimonite, 
or, as the miners call it, brown hematite) has resulted from the 
oxidation of iron, the iron existing in some state of combina- 
tion in the limestone and schist, and chiefly, I believe, in the 
limestone. 
The facts presented appear to be sufficient proof that the 
structure of the Mt. Washington part of the Taconic range is 
synclinal. 
The dying out of the Mount Washington synclinal southward 
has some features of special interest. : 
In the first place, the schist area abruptly narrows (as is seen 
on the map) along an oblique line through the village of Lake- 
ville, from a breadth of four miles to that of six-tenths of a 
mile near Ore Hill. 
tions could not be indicated on a geological map unless it were 
made on a very large scale. The small areas of limestone in 
the southwestern portion, numbere to 9, are, as already 
explained, the sites of some of the local anticlinals—of those of 
them which had the underlying limestone so near the surface 
that erosion has succeeded in exposing it to view. 
t thus appears that in the dying out of the synclinal, besides 
a flattening of portions of the general synclinal and the intro- 
duction of southward dips, there was also a multiplication of 
small subordinate flexures. ae 
_ Further, there is a multiplication of ridges of schist in the 
limestone area. 
Several such ridges, some quite small, are situated, as the 
map shows, southeastward of the mountain near the village of © 
Salisbury ; and others occur farther east. They consist of the 
same mica schist as the mountain, and look like fragments of 
