510 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 41. 



Neuropteris auriculata Germar, B. 

 Calamifes Imtovgac? B. 

 SpJienojihi/llutn obovatuni Sellards, 



B. 

 Sigillarial sp., B. 



Sigiflariostrobas hastatus, A, B. 

 Poacordcdtes, sp., A. 

 Walchia piniformis (Schlotheim), 



A, B. 

 Walchia hypnoides. A, B. 

 Walchia, f/racilis? A. 

 JJllmannia, sp., A, B. 

 Voltzia, sp., A. 

 Araucarites, sp., A, B. 

 Gomphostrobus bifldnn, B. 



the Triassic correlation that the bed has become known as an impor- 

 tant source of Triassic insects in America. A portion at least of the 

 material examined by Lesquereux now rests in the Lacoe collection 

 in the United States National Museum. Probably it belongs to a 

 horizon somewhat higher than the fossils collected by myself. I 

 therefore designate the Lesquereux species A, those collected by 

 myself being marked B in the following list : 



Provisional List of Plants from Fairplay, Colorado. 



SpJienopteris schinnperiana? B. 

 Sphenopfcrls lebachensis Weiss, A. 

 SphenojJteris dentata F. and I. C. W., A. 

 Spheiiopteris gutzholdl Gutbier, A. 

 Pecopterin pinnatifida Gutbier, B. 

 Pecoptcris foeminaeformis (Schlotheim) 



Zeiller., A. 

 Pecopteris arborescens (Schlotheim) Bron- 



gniart, B. 

 Pecopteris (Danaeites Goppert), sp., B. 

 ScolecopteHs elegaiis Gutbier, B. 

 CaWtpteris of. hynienophylloides 



Weiss, A. 

 Callijyterls cf. lyratifolia (Goppert), 



B. 

 Odontopteris subcrenulata Rost, B. 



As in previous lists, the types distinctly indicative of Permian age 

 are in boldface type. All of the forms that occur in rocks of Pennsyl- 

 vanian age have also been found in formations regarded by all as 

 Permian. The evidence of the Sphenopteris, the Calli])teris, and of 

 the gymnosperms leaves little room for doubt that this flora is of 

 Permian age, probably Rothliegende. 



In the Canyon of the Arkansas near Wellsville Station a lower 

 group of sandstones, limestones, and thin coals contains fossil plants 

 of Pottsville age. This belt of basal Pennsylvanian rocks in similar 

 composition, with coals and similar plants, appears to extend from 

 the region of Pecos City, New Mexico, northward to the vicinity of 

 Manitou, Colorado, and probably farther. It is unconformable, at 

 least locally, on older formations. A thin series, largely limestone, 

 which follows next at Wellsville, verges rapidly into the ''Ked Beds" 

 series. The latter carries lower "Coal Measures" plants about 900 

 feet above its base; and near a thin coal, about 1,100 feet higher, a 

 few fragments were found which seem to indicate a very high place 

 in the Pennsylvanian. 



Near the south portal of the railway tunnel, probably 800 feet 

 above the horizon last mentioned, or about 2,800 feet above the base 

 of the "Red Beds" series, a small but interesting flora was obtained, 

 which leaves little doubt as to the Permian age of its horizon. 



