UIINERALS 



40t 



JFerru^inous nodules are found at the Lower 

 Three Runs, and at other places in South Carolina ; 

 which on being broken present an hollow, like that 

 of a peach stone, but much larger ; containing 

 therein either a red or yellow ochre, in a proportion 

 ©f one fifth to the sand and grit mixed with it. 'Some 

 of this ochre has been ground and mixed up with 

 oil ; and when used, has been found so well adapted ~. 

 to painting, as to encourage further trials.* 



The western country abounds with alluminous 

 sc/nstusj which probably hereafter may turn to 

 great advantage in manufactures : and near the east- 

 ern foot of the North mountain in Virginia, according 

 to Mr. Jefferson, there are immense bodies of schis- 

 tus, containing impressions of shells in various forms. 

 In New York the schistus tract begins where the 

 granitic region ends, viz, at Pollepeli's island. The 

 interval space is of the breadth of forty yards ; and 

 to the north of this the slate rocks rise and form the 

 margin of the river. These schistic rocks prevail 

 through a large tract of country, and appear to un- 

 derlay all the limestone and calcareous earth. In 

 many places they constitute a large proportion of the 

 banks of the Hudson. Schistic rocks form the basis 

 of the beautiful cascade on Cornelius kill, near Cla- 

 vereck river ; the Blue mountains stand upon a basis 

 of slate. Dr. Mitchell, from whose excellent mine- 

 ralogical survey of New York these facts are taken^ 

 observes, that the obvious inference, from the dis- 



♦ Drayton's View of South CarelinJi, These ssind stones ate sfls^ 

 common in Pennsylvania. 



