OO NEW YORK STATE MUSEUM 



The writer's assistant, Charles H. Fulton, noted a narrow lenticu- 

 Vir streak of supposed ore about 400 feet below the summit of Moun: 

 McComb, where it had been exposed by a great landslide. A thin 

 section of it revealed about four-fifths hypersthene and. one-fifth 

 magnetite, presumably titanif erous, as the country rock is anorthosite. 



In the improvements of the roads which have been carried out in 

 the northern portion of the quadrangle, green syenite has been broken 

 for macadam, in the northwest foot of Baxter mountain. On the 

 south side of Baxter mountain about a mile east of the East branch 

 a broad decomposed zone of faulted and crushed anorthosite has 

 been dug for roads for many years. It is known as Beede's rotten 

 stone quarry. Abundant rocks in the boulders and ledges are every- 

 where available for highway work. 



In the days of the forges limestones was somewhat quarried, and 

 one or two ledges have been opened in old times in the northeastern 

 portion of the area. At present, however, there is no call for it. 



In mineral resources the area is, so far as known, not important. 



Mineralogy. Barite. A vein of crystalline barite has been 

 observed by H. L. Ailing crossing the portage trail midway between 

 the two Ausable lakes. Its strike is approximately N. 30° W. and 

 its thickness is 5 to 8 inches. It is creamy buflf in color. The wall- 

 rock is anorthosite. Under the microscope the barite shows evidence 

 of crushing, and contains minute augites and magnetites. The 

 specific gravity was roughly determined at 4.35. It is of interest to 

 note that an analysis of pyroxenic anorthosite from Elizabethtown, 

 by W. F. Hillebrand,^ yielded BaO, 0.05 per cent. 



Calcite in coarsely crystalline cleavage pieces is to be found in the 

 ledges of Grenville limestone and especially in the dumps of the old 

 Weston mine. 



Diopside in beautiful, green, rounded crystals is disseminated in 

 the included mass of Grenville limestone opposite the Cascade Lakes 

 Hotel. It is described on pages 19, 20. 



Garnet is abundant at the Weston mine, and in the contact zones. 

 In the latter it is a salmon pink color, when observed in thin section. 

 It has not been observed in well defined crystals. An analysis is 

 given on page 21. 



Hedcngergite, the iron-bearing pyroxene, was determined by Max 

 Roesler in connection with the garnet reaction rims. 



Hypersthene is occasionally met with in fairly coarse masses in 

 the anorthosite. An analysis is given on page 31. 



IN. Y. State Mus. Bui. 138, p. 36. 



