6^6 H. D. Miser — Llanoria, the Paleozoic Land 



Mazam shale l,000o Exposed in Ouachita region in Ar- 

 kansas; also present in this re- 

 gion in Oklahoma.<i 

 Ordovician (?)': 



Crystal Mountain sandstone. . .850o Exposed in Ouachita region in Ar- 

 Cambrian: kansas; also present in this re- 



Collier shale (observed thick- gion in McCurtain Co., Okla.Q 



ness) 200o 



The Caney shale and the underlying formations — the 

 Jackf ork sandstone, Stanley shale and Hot Springs sand- 

 stone of the Onachita Mountains — have been placed in 

 the Pennsylvanian series by some geologists but other 

 geologists and the accepted usage of the U. S. Geological 

 Survey place them in the Mississippian series. As the 

 proper correlation of these formations has an important 

 bearing on several features to be discussed below, brief 

 summaries of E. 0. Ulrich's opinion and of the evidence 

 supplied by their fossils are presented. The Stanley and 

 the Jackf ork have yielded a few plants and the Jackf ork 

 has yielded a few indeterminable invertebrate fossils, but 

 the Caney shale has yielded a rather large invertebrate 

 fauna and a few fish remains. No fossils have been found 

 in the Hot Springs sandstone. 



• In summarizing the evidence furnished by the plant 

 collections obtained prior to 1915 by the writer and others 

 from the Stanley shale and Jackfork sandstone David 

 "White^ says : 



' ' The discovery of better material will doubtless necessitate re- 

 vision of some of the tentative [specific] identifications. Possi- 

 bly they will show that the beds are Pennsylvanian, but the 

 aspect of the plant fragments and the apparent relations of the 

 beds strongly suggest that they are Mississippian. Accordingly, 

 I am inclined to regard them as Mississippian, and to suggest that 

 they are of Chester age, but the paleobotanical data available is 

 insufiicient to justify their conclusive reference to the Mississip- 

 pian. ' ' 



C. S. Prosser, who collected some fragments of fossil 

 plants from the Stanley shale in the city of Hot Springs, 

 Ark., made the following statement concerning them:^ 

 *^0n one of the olive pieces of shale is a fern pinnule, 

 which is similar to those of Sphenapteris. It resembles 



^ statement for use in the Hot Springs and DeQueen-Caddo Gap folios (in 

 preparation). 



^ Prosser, C. S., Notes on Lower Carboniferous plants from the Ouachita 

 uplift, Arkansas Geol. Survey Ann. Eept. for 1890, vol. 3, pp. 423-424, 1892. 



