582 



Report of the State Geologist. 



wild and mountainous strip; Bald mountain is 2,139 feet A. T., but less than 

 a mile south of its summit the Gulf runs east and west like a gash, and at less 

 than 1,000 feet above sea level. The northerly spur of Black mountain, at a 

 short distance from the south side of the Gulf, is 2,100 feet. Without careful 

 study I regard this as one of the faulted valleys to which reference was made 

 in my former report, p. 439. The main summit of Black mountain is 2,16 s feet. 

 It is separated by another wild gorge from an unnamed peak southwest <>f it 

 that attains at its summit 2,632 feet of altitude. Still further south is Jay 

 mountain, 3,287 feet in the town itself, and 3,601 feet just across the line in 

 Lewis township. At the extreme south the northerly spurs of Hurricane 

 mountain reach an altitude of over 3,500 feet. About three miles southeast 

 of Ausable Forks, a knob-like hill called Haystack rises to an altitude of 

 1,338 feet. From the west its outline well justifies its name. The western 

 town line runs along near the summits of several rather large hills of 

 anorthosite which are separated by cross valleys. The northerly one, Clark 

 mountain, is 1,577 feet, the next one south called Hamlin mountain, is 2,122 

 feet, then follows Bassett at about 1,900 feet, and Ebenezer at about 2,0' mi feet. 

 Southwest of the town is the huge mass of the Sentinel range, and just inside 

 the southern line of the main portion of the town is Clements mountain. 2.540 

 feet. On the western side of the southern extension, the contours on the 

 slopes of Big Crow mountain range from 2,000 to 3,300 feet. It is evident 

 from this outline that the easily accessible portions of the valley quickly rise 

 to the decidedly elevated and wild ranges of mountains, on the east and west, 

 which are from 1,500 to 3,000 feet above it. In scenic attractions the valley 

 is one of the loveliest in the mountains. 



Series L The gneisses constitute the northeastern corner for three 

 miles or more south of the Ausable river. Their strike as shown on the map 

 is variable, being north and south, northwest, northeast and even east and 

 west when corrected for magnetic variation. On the east, the rock is a very 

 coarsely laminated variety with very abundant lenticular masses of quartz up 

 to two or three inches long, that lie between corresponding lenses of red 

 feldspar. 



In thin section the feldspar proves to be microperthitic orthoclase, 

 or microcline in largest part. Dark silicates are subordinate, with hornblende 

 the commonest one present, but biotite is also often seen. Xos. 5, 6, 9, 10, 11, 

 12 and 13 are of this character. Just across the bridge over the Hast Branch 

 at Ausable Forks, a dark green gneiss outcrops in the bank at Xos. 1 and 2. 

 It looks much like the rocks of Series III, but in thin section it is seen to 



