Structure North of Lake Mohonk. 27 
eunk mountain consists of a great mass of Hudson shales, which 
are being rapidly and deeply eroded. They extend southward 
nearly to lake Mohonk, where the crest of the anticlinal is occu- 
pied by grit for some distance. The grit in the western limb of 
the anticlinal on the northern end of the mountain lies part way 
down the western slope and does not attain the prominence that 
it has in the area terminating in Buntico point. It constitutes 
a monoclinal ridge, with a line of cliffs along its eastern edge, 
above which the hills of Hudson shales rise several hundred feet. 
To the westward the Shawangunk grit dips beneath overlying 
formations in the synclinal valley of Coxingkill. On the opposite 
side of this valley, at High Falls, there rises one of the principal 
anticlinals of Shawangunk mountain, which soon brings up 
Shawaneunk grit in the low ridge on which the village is built. 
This ridge gradually increases in width and altitude southward, 
and near the line of the third section on the stereogram its crest 
is nearly as high as the ridge eastward, from which it is sepa- 
rated by the synclinal valley of the Coxingkill. 
PALTZ PT. 
Fiaure 1.—Cross-Section of eastern Ridges of Shawangunk Mountain through 
‘Lake Mohonk, looking northward (S, Shawangunk Grit; H, Hudson Shale). 
Vertical scale exaggerated. 
South of Alligerville the mountain widens rapidly as flexure 
after flexure brings up the Shawangunk grit from the northwest- 
ward. The western ridge rises gradually on the upward pitch of 
the axis of the flexure, and finally becomes the highest part of 
the mountain east of Ellenville. Southwest of lake Mohonk 
there are five of these flexures, together with various small un- 
dulations, with a creek in each synclinal. Lake Minnewaska is 
in the crown of the anticlinal which rises at High Falls, and lake 
Awosting is on the western slope of the same flexure. 
These lakes are all situated near the eastern side of the moun- 
tain and about 150 feet below the crest. They are similar in 
relation and originated under almost the same conditions. Lake 
Mohonk occupies a north-and-south clett in the crown of the 
