Red Sand Stone formation of North-Carolina. 174 
Uses—Though the colour of the mineral is blue or 
bluish grey, the fragments which have for some time been 
exposed to air and light, assume an appearance in some 
1 d 
the softest of iron. He performed also the process of bra- 
zing several times, by which he proved its very great supe- 
viority to borax in two respects; its requiring a much 
smaller quantity, and its remaining more fixed in a high 
eat.” ete 
14. Red Sand Stone formation of North- Carolina. — 
Evtract of a letter from Professor D. Outmstean, of the 
College at Chapel-Hill, North-Carolina, dated Feb. 26, 
4 
An extensive secondary formation has lately been discov- 
ered very near us. On the road between this place an 
Raleigh, travelling eastward, we come to it four miles from 
the College ; but at another point it has been discovered 
within two miles of us. It is a sand stone formation. The 
varieties are the red and grey. I have traced it through the 
counties of Orange and Chatham, and have ascertained its 
breadth, between this and Raleigh, to be about seven miles. 
Its direction is a little west of south. If a line be drawn 
through the Richmond bason parallel to the great_moun- 
tains west of us, it will pass through this formation. Hence, 
raust we not regard this as_a continuation of the great sand 
stone formation, which W. McClure has traced to the Rap- 
pahannock? Must we not consider the Richmond bason 
and this as forming parts of the same formation? The va- 
tiety found nearest to this place is not unlike the old red 
sand stone found in your vicinity. 
It was natural to look for coal here, and I have for some 
time directed the atterttion of my pupils, and of stone-cut- 
