1890.] NATURAL SCIENCES OF PHILADELPHIA. 117 



The hard gneisses appear iu the bottom and side. The face of the 

 quarry shows alternations of the hard gneisses with decomposed rock. 



At the north wall of this quarry a very regular stratum gave 

 strike N. 30° W. dip 50° N. E. West of this, along the railroad 

 there is a prevalent easterly dip 45° to 70°. The strike is quite ir- 

 regular, owing to contortions in the strata ; N. 0° E., N. 30° E., N. 

 20° W. were observed. 



South of the Sharpless road is low ground and a creek flowing 

 from the northwest; south of this is a hill showing the gneiss with a 

 cut 150 feet long through part of it. At the north end the gneiss is 

 very massive and irregular. In the middle it is coarse and very 

 feldspathic, over this part a southeast dip is visible, at the south end 

 there is a northwest dip of 70° to 90° with a strike N. 60° E. 



On the Sharpless road, east of Chester creek the same gneisses ap- 

 pear much decomposed. 



Along the bottom of the creek mentioned as flowing from the 

 northwest into the Chester creek at the Sharpless road the same 

 gneiss is quite abundant in loose masses. 



On the west bank of Chester creek close to the serpentine, no out- 

 crops are visible but there are loose masses of the gneiss, and 300 feet 

 south, it occurs in place. 



The outcrop at Joel Sharpless' is shown as tAvo in a line N. E. 

 and S. W. I found but one, at the summit of a high hill about 

 one hundred yards south of the road and approximately par- 

 allel to it (N. 70° E). The only rock visible is the honey-comb 

 quartz but it is in large quantity over several acres of ground. The 

 gneiss is visible in the road and occurs also in large loose masses in 

 the next field south of the quartz. 



The Sharpless feldspar and mica quarry is not to the north of the 

 serpentine but to the southeast, and on the east side of the small 

 creek shown on the map. This quarry is in an exceedingly coarse 

 granite containing much orthoclase and mica, the latter crystallized, 

 the orthoclase in the upper part kaolinized, Some crystals of the 

 mica are more than a foot iu length and breadth, but the larger crys- 

 tals seem very irregular, and I am informed that much of the mica 

 was unmerchantable. The quarry has not been w'rought for years 

 and evidently the work was not systematically conducted. Very 

 large beryls occurred in the granite. 



AH the Delaware and Montgomery county outcrops close to the 

 Laurentian are characterized by the general very dark color and great 



