WICHITA FORMATION OF NORTHERN TEXAS 131 



All the Old World species in the lists occur in the Permian of 

 western Europe, and of the remaining species apparently every one 

 which is not new is found in the Permian of Kansas. Taeniop- 

 teris, in simple fronds, is represented by several species character- 

 istically lower Permian. Other types proper to the Permian are 

 the Odontopteris form, the genus Gomphostrobus, Annularia spicata, 

 the S pheno phyllum forms, one of which approaches 5. stouken- 

 bergii, and the scales provisionally referred to Araucarites, while 

 the presence of Walchia assures a horizon as high as the highest 

 "Coal Measures." 



The presence of Gigantopteris, abundant at locality No. 2, is 

 particularly notable since the genus is not definitely known except 

 from the coal fields of central and southern China, where it occurs 

 in beds associated with the coals overlying other terranes which, 

 on the evidence of their contained invertebrates, have been referred 

 by the French geologists to the lower Permian. The genus is 

 certainly close to, if not actually identical with, a form described 

 from several small fragments from the Permian of the Ural region. 



In accordance with the paleobotanical standards of western 

 Europe, I refer the plants of the Little Wichita in Texas to the 

 lower Permian, the terranes being probably referable to the Chase 

 group in Kansas. In this connection it should be observed, how- 

 ever, that the Artinskian flora of the Urals is essentially Permian, 

 and that paleobotanists universally agree with the general usage 

 of the geologists of western Europe in referring the Artinsk to the 

 Permian. 



DESCRIPTION OF LOCALITIES 



Note. — The number at the left is the locality number as given at the head of 

 the list and indicated on the map. The first numbers following the description of 

 locality are the Survey permanent record numbers, the second the temporary or 

 field numbers. 



1. Bar-X Crossing, Big Wichita River, three miles north of Fulda Station, 

 5247 (Gi. 67). 



2. Bluff of Wichita River, one mile west of Bar-X ranch house, 5243 

 (Ri. 29). 



3. One mile east of Old Military Crossing, Wichita River, 7025a. 



4. Two miles north of Wichita River, near Old Military Crossing. 702 5&. 



