OF ARKANSAS. 97 



The formations here appear to be of the same character and age as 

 those in the lead region of the eastern part of this county, and the west- 

 ern part of Marion, already described in the first part of this Report; it is 

 probable, from this analogy in the two regions, that lead ore will be found, 

 to some extent, disseminated in pockets in the calcareous members, in 

 the same manner as it occurs in the Coka and Mitchell diggings. 



Four of the most conspicuous hills of the Osage range, in the north- 

 west part of Carroll county, in sight of Berryville, have received the names 

 of the " Sister," " Grandfather," and " Indigo" knobs. The Sister hill, 

 nearest to Berryville, gave a height of 370 feet above the Berryville 

 branch of King's river. The summit rocks on this hill are the red, varie- 

 gated, and encrinital marble limestones; but most of the layers on this hill 

 appear to be too earth}-, and too prone to decomposition for ornamental 

 outside work. 



The w Fire-stone " was found in place about 15 feet from the top, and 

 the ;: Cotton-rock" towards the base of the principal ascent, at an eleva 

 tion of about 70 to 80 feet above the branch from which the levels were 

 taken. 



In sighting with the level, across from the Sister to the Grand-father 

 knob, a bench of rock was observed, cropping out about 80 or 100 feet 

 from the top, corresponding, in level and position, to the red, variegated, 

 and encrinital limestones that crown the Sister-hill. By computation, the 

 Grandfather-peak must be nearly 100 feet higher than the Sister-hill. 



The succession of the different beds of rock, forming the hills in Prairie 

 township, as far as they have yet been observed, is as follows: 



1. Subcarboniferous chert. 



2. Sandstone. 



3. Light-grey, subcarboniferous limestone. 



4. Chert. 



5. Encrinital, pink and red limestones; the place of the marble rock. 



6. Sandstone; about 70 feet in thickness. 



7. Chert. 



8. Magnesian limestone and sandstone. 



9. " Cotton-rock," a variety of magnesian limestone. 



10. Magnesian limestones, some of which, probably, possess hydraulic 

 properties. 



Three or four pounds of lead ore are reported to have been found adja- 

 cent to the town of Berryville, on land owned by Berry. The remarks 

 previously made in regard to the lead region of the eastern part of Car- 

 roll county, will apply also to Prairie township. 



Five miles north-west of Berryville, on the Osage, is a locality worthy 



