SANDSTONE REGIONr 



'41 



iiine iDiles of Nazareth. Mr. Guillemard, in -his 

 journey from Philadelphia to Pittsburg by the way 

 of Sunbury, found it every where till he came to the 

 wxst of the Alleghanies, called in that district Blue 

 Hills, except in a few calcareous valHes. Lastly, 

 in Virginia, from Charlottesville to the river Gauley, 

 Mr. Volney found it in abundance on the ten or 

 twelve chains he crossed successively, excepting 

 likewise the calcareous valleys of Staunton and-Green 

 Briar. Sometimes the sandstone admits the mixture 

 of a milky white quartz, called arrowstone, much of 

 which he found on Blue Ridge going from Frederick 

 Tov/n to Plarper^s Ferry ; and sometimes also with 

 grey quartz, which is the nucleus of Blue Ridge, 

 at the gap made in it by the Potowmac below Har- 

 per's Ferry. Some (>f the rocks of this gap are of 

 granite, but these are few in number. 



These mountains of sandstone are not so bare, as 

 the nature of this stone might lead us to suppose* 

 Their loftiest summits in Virginia between the rivers 

 of Green Briar and Gauley are covered with fine 

 trees, and tall perennial plants, growing in. the ex- 

 cellent black Kentucky mould, which is the -distin- 

 guishing characteristic of the Western country. 

 The lofty region, that extends above Fort Cumber- 

 land beyond the sources of the Potowmac to those 

 of the Yohogany, and which is known by the nansc 

 pf Green Glades, is a real Switzerland, verf rich in 

 pastures, the vigour of which is maintained through - 

 out the summer by clouds, mists, and drizzling rain, 

 which at this season are wanting in the plain. This 

 ^advantage is owing to an elevation of about 700 yards, 

 as was before observed ; but it does not extend tr. 



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