OF ARKANSAS. 95 
1. Sandstone. 
2. Chert. 
3. Light-grey limestone. 
The Pilot Knob, near Charles Hutchison’s, has the same general ‘geo- 
logical structure as the Boat mountain. 
Four and a half miles from Carrollton, the Archimedes limestone was 
observed with remains of a dark shale over it. Under this limestone 
comes in a sandstone, which has much the appearance of that over the 
grey limestone on Crooked creek ; it is not likely that they can occupy the 
same geological horizon, unless there has been a great thinning away of 
the measures that form the base of the Boat mountain. 
Some loose pieces of conglomerate were also seen between four and six 
miles from Carrollton. 
The descent to Terrapin and Long creeks, is about 890 feet; in the bed 
of the former creek, entrochital, cherty limestone was found. 
Along with some yellow pyrites, which was submitted to me for exami- 
nation by the citizens of Carrollton, there were some specimens of a blu- 
ish-black scoriaceous ore, in some of which I detected a notable quantity 
of copper. This ore was said to have been obtained in the Childer’s 
mountain, about seven miles west of Carrollton, on the waters of Corne- 
lius or Dry creek. This ore has the appearance of some of the Duck- 
town copper ores of Tennessee; and, as I found samples of that variety of 
Tennessee copper ore in the hands of the brother of the individual who 
brought the ore into town, I thought it probable that this might be a sam- 
ple of Tennessee ore, which, from inadvertency, had been mixed and con- 
founded with the pyritiferous ores of the Childer’s mountain. On this 
account, and as the locality of this ore was then only known to the indi- 
vidual who collected it, and he was from home, I concluded, as my pro- 
posed route through Carroll county lay north-west, to request the Hon. W. 
W. Watkins, as scon as it was convenient for him, to visit the locality on 
Childer’s mountain in company with the discoverer of the ore. This he 
afterwards did, and subsequently addressed a letter to me, dated the 6th 
of July last, in‘which he states that there was no mistake as to the ore 
having come from the locality, since he had now obtained specimens from 
the mines himself, viz.: on south-west quarter of section 31, township 19 
north, range 23 west, and had forwarded some specimens to await my 
arrival at Little Rock. These specimens I received at Little Rock, and 
have now had an opportunity of testing them for copper, in my labora- 
tory, by the application of the reagents considered most delicate for 
the detection of that metal, without obtaining any copper reaction. If 
copper is to be found amongst these ores, in the Childer’s mountain, it 
can be only sparingly and locally disseminated. 
