440 A. Guyot—Physical Structure and Hypsometry 
in the northwest terminal chain, Sutton Gap, 2236 feet ; 
Potter’s Hollow Gap, 1966 feet; Bennet’s Notch, 1997 feet. 
4th. The highland between these two main chains has, as 
remarked before, the shape of an irregular parallelogram. Its 
length is about twenty-seven miles; its width, between the 
Plaaterkill and South Mountain, only six miles. It increases 
to ten miles between Stony Mountain and Black Head, reaches 
its maximum—fifteen miles—between Deep Hollow and Pisgah, 
and is reduced to 124 miles between Grand Gorge and High 
Knob. The central part is filled by three ranges, separated by 
valleys in which flow the tributaries of the Schoharie Creek: 
Ist. The Eastkill and East Jewett Range starting from the 
North Mountain and running a few degrees north of west, 12} 
miles long; 2d. The Black Head Range, from Black Head due 
west, continued by the West Jewett Range, sixteen miles long; 
8d. The Pisgah Range running west 10° south, a distance of 
ten miles. i 
The EHastkill and East Jewett Range, between the main 
Schoharie Creek and the Eastkill, is divided into two parts by 
the Parker Notch, 2415 feet. The first detaches itself from 
the North Mountain, 3442 feet, and descends rapidly to the 
Star Rock of Parker Hill, 2545 feet. The second to the west 
rises again to 3190 in the Hastkill Mountain, and 3146 in 
Hast Jewett Mountain; both north of Hunter village, on either 
side of a deep notch. 
The Black Head Range runs from Black Head nearly due 
west for five miles, gradually descending to the Big Hollow 
Gap road. Its great height, its massive forms, its fine rounded 
summits, whose aspects vary from every new point of view, 
make it the most conspicuous of these inner chains and a 
prominent feature of the landscape. The central part, the long 
and symmetrically shaped Black Dome, attains the height o 
4003 feet. It is cut off from its neighbor Black Head with its 
steep and rocky slopes, by the Lockwood Gap, 3446 feet; 
while the following peaks to the west: Mt. Kimball, 3960; 
No. 4, 8566, and No. 5, as yet nameless, are only separated by 
slight depressions. 
_ Between the Big Hollow and Henson Gap roads, 1800 feet, 
rise two rounded hills, 2500 feet high, cultivated to the top, 
and from which one of the most varied and extensive pano- 
ramic views of the Catskills may be obtained. On the same 
line, farther west, the Jewett Range has an altitude of 3025 
feet, at its culminating point, just above Windham Center; and 
of 2931 feet in the conical Tower Mountain, above Ashland. 
This Black Head Range, with its continuation, separates the 
valleys of the Eastkill and Bataviakill, the two main tribu- 
taries of the Schoharie Creek. 
