196 THE JOURNAL OF GEOLOGY. 



The Poteau mountain marine beds are of about the same age 

 as the Wyoming valley limestones^ of the Upper Productive Coal 

 Measures of Pennsylvania, and these belong below the Dunkard 

 creek series of the Upper Barren Coal Measures. The Dunkard 

 creek'' beds have lately been proved by Professor I. C. White to 

 be of the same age as the Permian of northern Texas, on the 

 basis of plant remains that also occur towards the top of the 

 Wichita series of Texas, in which marine Permian fossils 3 have 

 already been found. 



But the paleobotanic evidence aids in establishing the age of 

 the Upper Coal Measures only ; plants are not reported from 

 any horizons of the Lower Coal Measures, although they are 

 known from a few localities. 



Owen'' mentions Stiginaria ficoides as occurring at Patterson's 

 mill, near Bee Rock, on Little Red river. White county. In 

 August, 1892, a few plants were found by the Survey in the Bee 

 Rock sandstone, near the base of the series and below most of 

 the marine fossils, but none of these could be identified. 



General D. McRae, of Searcy, informed the Survey that in 

 Township 7 N., Range 7 W., Section 4, in White county, were 

 found shales containing numerous Lepidodendra and ferns. These 

 shales are above the Bee Rock sandstones. 



In a well at Dr. Griffin's, Township 5 N., Range 10 W., Sec- 

 tion 5, near El Paso, White county, specimens of Lepidodeiidron 

 were collected by Dr. J. C. Branner, in micaceous flaggy sand- 

 stone, thought to be of the same age as the shales of Searc}-. 

 About fifty feet above the flaggy sandstone was found a thin bed 

 of coal, and thirty feet higher was another coal bed with 

 numerous ferns and Catamites in the overlying shales. 



C. S. Prosser^ mentions plants supposed to be of Lower 



^Second Geol. Sur. of Pa., An. Rep., 1885, pp. 437-458, C. A. Ashburner 

 and A. Heilprin, " Report on the Wyoming Valley Limestone Beds." 



^Bul. Geol. See. America, Vol. III., p. 217. 



3 Dr. C. A. White, Bulletin 77, U. S. Geological Survey. 



'* Second Geol. Recon. Ark., Vol. I., p. 68. 



5 Ark. Geol. Survey, An. Rep., Vol. III., 1S90, p. 423. 



