1893.] NATURAL SCIENCES OF PHILADELPHIA. 195 



This material was penetrated tor between 40 and 50 feet when 

 the body of the roll was met, dipping about 15°. Here, at the 

 bottom of the drift, on the east side, was a white granular quartz 

 with intermingled quartz crystals some of them rolled. In three 

 feet this increased from a half inch to three inches in thickness 

 accompanied by a harsh silicious carbonaceous rock containing 

 pyrites and chalcopyrite and some steel gray crystals not determined. 

 This seemed to continue, but water coming in, the exploration was 

 abandoned. The quartz crystals exhibited show among other things 

 as follows : 



1. A transparent, doubly terminated smoky crystal with a fluid 

 inclusion and also small pearly crystals ; also a rectangular and a 

 hexagonal prism beside moss-like aggregates. Near the apex of the 

 pyramidal termination there is a pearly crystal in form resembling 

 a twin of selenite. 



In another position, the same crystal shows a vast number of 

 inclusions, some mere points, others fine lines, circles and rosettes, 

 colorless, yellow, orange and black. A group of twelve quartz 

 crystals associated with chalcopyrite and perhaps ilmenite. These 

 under the microscope show octahedral crystals included, with fluid 

 and bubble-containing cavities. 



2. Crystals, colorless and transparent, also smoky and some 

 opaque, containing inclusions in fine lines and other figures. These 

 were obtained in a loose blue clay, arising from the decomposition 

 of the soft blue shales of the Chemung formation, and also from a 

 cylindrical chimney, six inches in diameter and two feet long which 

 was found near the top of the drift. The crystals were loose, in a 

 mass of decomposed ferruginous calcite and clay. 



3. Similar crystals in ferruginous calcite, found between con- 

 glomerate and dolomitic spar in the roll. 



4. A white and grayish-white laminated or tabular quartz in quite 

 thin plates, the surface studded with minute quartz crystals with 

 occasional larger transparent or milky crystals. 



The slates accompanying these gave evidence by slickensided 

 surfaces of movement under pressure. 



5. Quartz crystals upon crystallized calcite and dolomite ; the 

 surfaces coated with minute crystals. 



6. These occurred with the tabular quartz described above and 

 are in nodular masses of metamorphosed slate and shale. Some 

 crystals are transparent, others dark smoky to black. Some of the 



