GEOLOGY OF MOUNT MARCY 



59 



THICKNESS 



Pass northwest PitchofE mt 



Opposite Cascade Lake Hotel 



East branch Ausable river. Northern edge of 

 quadrangle 



Brook bed west of Weston mine; 2 dikes 



Southeast side of Baxter mt 



High Falls, on trail to Indian pass 



North slope of Maclntyre mt. half mile below 



summit 



West side Table Top mt. Marcy trail 



Johns brook below Ore Bed brook; 3 dikes . . . 



Northwest slope Wolf Jaws above Johns brook; 



3 dikes 



East side Rooster Comb mt 



Flowed lands 



Indian Face 



East branch, 2 miles southwest Ausable Club . . 

 Noonmark trail; 2 dikes 



N. 58° E. 60° E, 

 Northwest 



N. 75° W. 90°. . 

 E. and W. 90° . 

 IS. 55° E. 90°. . 

 N. 45° E. 90°. . 

 N. 60° E. 90°. . 



N. 70°E 



N. 45° E. 90°. . 



N. 27° E.; N. 67 



E.; N. 62°E. 



N. 45° to 60° E. 



N. 45°E 



N. 65° E. 90°. . 



N. 34°E 



N. 34°E 



N. 6s° E. 90°. . 

 N. 65° E. 90°. . 



2 ft 



6 ft. and small 

 branches. . . 



5 to 6 ft 



Sft 



3 ft.; 9 ft 



I ft 



3 in 



1 ft. 6 in 



2 ft 



I to 3 ft 



I to 4 ft. 6 in. . 

 Uncertain .... 



1 to 2 ft 



7 in 



2 to 3 ft 



I ft. 3 in 



6 ft 



Diabase 



Diabase* 



Camptonite* 



Camptonite* 



Diabase 



Diabase 



Diabase 



Diabase 

 Diabase 



Camptonite* 



Diabase 



Diabase 



Diabase 



Diabase 



Diabase* 



Diabase* 



Diabase* 



Undoubtedly there are more dikes in the quadrangle, some of 

 which may be noted by other observers from time to time. Of those 

 recorded, all are in the northern two-thirds of the area. 



ECONOMIC GEOLOGY; MINERALOGY 



Economic geology. With the passing away of the old-time 

 forges, the small mining industry ceased as well. The only iron 

 mines of importance were the Weston mines, which have been 

 described in detail on pages 22-27. They are unique in Adirondack 

 geology in supplying ore from deposits in limestone walls, and are- 

 believed to be due to contact metamorphism. In the syenitic gneisses 

 in the slopes between Owl's Head peak and Keene Center, but just 

 beyond the edge of the Mount Marcy sheet, an opening was made 

 years ago on a narrow body of lean ore, locally known as Rogers 

 ore bed. Much hornblende was associated. The exposure seemed 

 to be a basic streak in the syenitic gneiss. 



Magnetite is known in Cascade mountain near the included and 

 metamorphosed limestone described on pages 17-20. Only a small 

 amount was ever blasted from the steep precipitous front. 



The name Ore Bed brook for the tributary of Johns brook would 

 suggest an ore-'body, and of its existence stray statements have been 

 heard; but personal search according to directions failed to locate 

 the prospect. One would anticipate titaniferous ore from the local 

 geology. 



