Smith.] ^28 [Oct. 2, 



Uj)per Coal MoassurL'S only ; i)lants are not reported <mi iVoin any hori- 

 zons of the Lower Coal Measures, although they are known from a few- 

 localities. 



Owen* mentions Stujmaria ficoides as occurring at Patterson's mill, 

 near Bee Rock, on Little Red river, White county. In August, 1892, a 

 few plants w^ere found by the Survey in the Bee Rock sandstone near 

 tlie base of the series and below most of the marine fossils, but none of 

 these could be identified. 



Mr. D. McRae, of Searcy, informed the Survey that in 7 N., 7 W., 

 section 4, White coiTnty, were found shales containing numerous Lcpi- 

 dodenclra and ferns. These shales are above the Bee Rock sandstones. 



In a well at Dr. Griffin's, 5 N., 10 W., section 5, near El Paso, White 

 county, specimens of Lepidodendron were collected by Dr. J. C. Bran- 

 ner, in micaceous flaggy sandstone, thought to be of about the same 

 age as the shales of Searcy. About fifty feet al)ove the flaggy sand- 

 stone was found a thin bed of coal, and thirty feet higher was another 

 coal bed with numerous ferns and Calamitcs. 



C. S. Prosserf mentions plants supposed to be of Lower Carbonifer- 

 ous age, from Shinall mountain, in 2 N., 14 W., section 17 ; also from 

 section 20 of the same township. 



In quarries in the sandstones of Big Rock, near the city of Little 

 Rock, are found plant remains of indeterminable character. The 

 stratigraphy of the Survey places the three last localities in the Lower 

 Coal Measures, and probably above the fossiliferous sandstones of Bee 

 Rock, on Little Red river. 



The Pacific Cahboniperous Sea. 

 Bevolution in Bevonian Time. 



In Paleozoic times there have been many revolutions and alterna- 

 tions of continents and seas, and consequent readjustment of their 

 inhabitants to new surroundings. One of the greatest of these revolu- 

 tions was that which broke up a large zoological province, and put in 

 direct connection regions that before were separated. 



Dr. A. Ulrich:}: has shown that in Lower and Middle Devonian tin- 

 faunas of Bolivia, Brazil, the Falkland Islands and South Africa were 

 very similar to those of North America, and that they were very difter- 

 ent from the fiiunas of Europe and Asia. This state lasted until the 

 end of the Middle Devonian, when the revolution began. Prof. II. S. 

 Williamsg has shown that with the beginning of the Upper Devonian 

 in America there came in a fauna, many sjjecies of which were not the 

 direct descendants of those immediately ])reccding them. This new 



* Second Geol. Reconn. Ark., Vol. i, p. 68. 

 fArk. Gcol. Survey Ann. RejJ., Vol. iii, 1890, p. 423. 



XBeitrdge zur Geoloi/ie und Palaont. Siidamerika, I, " I'aUiozoischo Versteinoningcii aiis 

 Bolivien." 

 g Bull. Geol. Soc. Amer., Vol. i, " The Cuboides Zone and Its Fauna." 



