OF ARKANSAS M1 
The first and highest 
member of this section— 
Feet. 
Inches. 
Ls | the sandstone formation 
wean —occupies the summit of 
Ts the ranges of hills adja- 
|_s | cent to White river, 
Pesce ee above and below the 
| mouth of Brush creek, 
ie and will, doubtless, be 
2002) |White, yellow and brown sandstones, some offfound capping many of 
which have a cellular structure. the isolated peaks, which 
rise in various directions 
out of the barrens and 
prairies, on both sides of 
the Missouri road lead- 
ing to Springfield. The 
second member underlies 
more immediately those 
=| 402] |Ferruginous and dark shales. south-east sections of 
land, bordering on White 
river, that are elevated 
401 150 to 200 feet above that 
stream, while the under- 
Chert and cherty barren limestone. lying chert and cherty 
35 limestone form cliffs on 
White river, near the 
mouth of Brush creek, 
Black cherty shale. : and become the surface 
rocks in the north-west 
part of the county, in consequence of the rise of the geological forma- 
tions in that direction. 
This latter rock is, no doubt, for reasons already advanced in the pre- 
ceding section, the source of the pieces of lead ore which, according to 
the statements of many citizens, have been occasionally picked up in this 
township and along some of those branches, forming the heads of the 
Illinois river, which take their rise in the northern part of this count 
This inference is further corroborated by the statement of William Ray, 
that he had dug out a wagon-bed full of lead ore, somewhere in town- 
ship 17 north, range 29 west, 6 to 8 miles north-east of Fayetteville. 
Three miles north-west from the mouth of Brush creek, considerable 
