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 390 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". ATatkins, as soon 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. 



