OF ARKANSAS. JQ1 



sandstone, especially on the western declivity, descenling to Warton's 

 creek. 



{. At Dotson's farm, on that stream, underneath these formations, a blade, 

 bituminous, sheety shale crops out, similar to the shale of Wiley's Cove, in 

 Searcy county, of which 15 feet can be seen exposed on the west bank of 

 the creek. This shale dips at an angle of 5 or G dcg. down stream, and 

 is soon lost to view under flagstones, these again dip under argillaceous 

 shales, including a fen-uginous, calcareous band, charged with the remains 

 of producta and chonetes, of which the P. elegans is the most abundant. 



The ridge dividing Warton's creek and War Eagle, is 290 feet above 

 the former stream. On the top of this ridge, some GO to 80 feet of con- 

 glomerate overlies subcarboniferous limestones, shales, and sandstones. 



The succession on Warton's creek and War Eagle, is as follows: 



1. Ferruginous and argillaceous shales. 



2. Conglomerate sandstone. 



3. Shales, both black and ferruginous. 



4. Millstone grit and shaly sandstones. 



5. Shales. 



6. Archimedes and pentremital limestones. 



7. Black shale, thin. 



8. Grey shales, including band of productal calcareous rock. 



9. Flagstones. 



10. Dotson black sheety shale. 



No. 10, the Dotson black shale, is the lowest bed visible in this part of 

 Madison county. 



Five miles above Huntsville, concretionary and schistose beds of Archi- 

 medes limestone form the bed of War Eagle, and a rugged bench of 

 harder layers of the same rock borders for some distance its north bank, 

 like an artificial wall. Some dark shales are intercolated amongst these 

 upper subcarboniferous limestones on this stream. Here the dip is south- 

 easterly, so that the flagstones and dark shales soon rise from beneath the 

 aforementioned limestones, in a north-west course. 



The surface of some of the slabs, both of the flagstones and harder 

 shaly strata, is covered with cylindrical and conical impressions, often in 

 high relief, some of which are in semi-lunar whorls or coils. These are, 

 probably, referrible to various species of fossil fucoides, or sea weeds; but 

 the structure is so obscure that the inference of their origin is, at present, 

 rather problematical. 



All the ridges passed over between King's river and War Eagle, had a 

 capping of conglomerate, which is separated from the Archimedes lime- 

 stone by ferruginous shales; these are, however, not as thick as in the val- 



