1894.] NATURAL SCIENCES OK PHILADELPHIA. 457 



the Brandywine, iu West BVandywiue Township, about half a mile 

 N. 55° E. of Wagoiitown. There are large, loose masses, some of 

 them of a schistose variety of the gneiss, containing apparently 

 hornblende and mica, and not soft, and others of similar appearance, 

 but soft enough to be cut readily with a knife, a steatite. No fast 

 rock was visible. To the north of it a hard, heavy bedded horn- 

 blende gneiss occurs. I was informed by Mr. Windle that consider- 

 able quantities of steatite have been obtained from this point, and 

 used in the furnaces at Coatesville. 



The next locality is a half mile or less N. 75° W. of Wagontowu, 

 or a little over three-fourths of a mile due west from the Windle 

 outcrop. These measurements and orientations are estimated from 

 the township map published by Breou, 1883, but a sighting of the 

 localities on the ground by compass (magnetic variation allowed for) 

 gave the direction N. 65 E. , an inexplicable difference of 25°. 

 This emphasizes the need of an accurate topographical map like 

 that of the New Jersey survey. 



This locality, on the farm of Abraham Brubaker, is immediately 

 north of the Lancaster road which passes through Wagon town (not 

 the Lancaster Pike, an approximatively parallel road a mile and a 

 half to the southward). An area of several acres of ploughed land 

 is strewn with numerous masses of steatite, mostly of small size, 

 while occasional fragments of basins and pots, and more rarely picks 

 made from trap rock give evidence that the red man had a work- 

 shop here. No rock certainly in place was seen in this field, but a 

 resident informed me that forty years ago a quarry of soapstoue was 

 wrought at this place, out of which large blocks were taken for use 

 in furnaces. With the steatite are small masses of schistose gneiss, 

 also quartz, some of it containing tourmaline. In the steatite octa- 

 hedral crystals of magnetite occur rarely. 



On the westerly edge of this field is a ridge of loose sandstone 

 rock only fifteen or twenty feet wide, looking as if hauled and 

 dumped along a fence line, but the size of the slabs, and their simi- 

 lar orientation, showed that they had not been moved far, or by 

 other than natural forces. A few hundred feet to the westward there 

 appeared a high, steep ridge of Cambrian sandstone, precipitous 

 on its southern side. The rock at Brubaker' s is evidently the eastern 

 termination of this ridge of sandstone, as it does not appear on the 

 Brandywine in the line of strike. It apparently extends westward 



