140 KANSAS UNIVERSITY SCIENCE BULLETIN. 



is brought to light by Doctor Williston in the description of 

 labyrinthodont remains which seem to belong to a genus not 

 heretofore known below the Triassic, from a horizon about 

 200 feet below the horizon of the Dexter bones, in southern 

 Pottawatomie county, Kansas.*' These remains were pro- 

 visionally referred to the genus Mastodonosaurus. 



These vertebrates are considered to be quite as ephemeral 

 as any invertebrate species, and equally good, for that rea- 

 son, for purposes of correlation. In the light of these facts, 

 it would seem that the base of the Wichita division of Texas 

 might be somewhere in the neighborhood of the horizon of 

 the Garrison formation of Kansas. This has an interesting 

 bearing on the location of the line of division between the 

 Pennsylvanian and Permian of Kansas, and, together with 

 published data on the plants and the known invertebrate 

 fauna, go to demonstrate that the base of the Permian has 

 not been placed too high by the Kansas geologists in using 

 the Wreford limestone as its lowermost formation. 



In April, 1902, the present writer published a note with 

 the figures of some fossils from the Whitehorse sandstone, 

 eighteen miles west of Alva, Okla, The species mentioned 

 were Bakeivellia (referred provisionally to Cyrtodontarca ) 

 gouldii, Coiiocardium oklnhomaensis , Aviculopecten vanvleeti, Na- 

 ticopsis sp., Pleurotomaria sp., Dielasma scliucherti, and Schizo- 

 dus sp. After a brief discussion of the fauna, the following 

 statement is made : "Taking all this into consideration, there 

 can be but little doubt that the age of these beds is Permian." 



It is interesting to note that work in the Rocky Mountain 

 region is showing similar results to those obtained near the 

 foot of the high plains to the eastward. Cross and Howe 

 have recently carefully described the unconformity between 

 the Triassic Red Beds and the underlying beds, supposed to 

 be the Permian, in Colorado. Drake described this uncon- 

 formity to the west of the Llano Estacado, and Williston has 

 discovered a rich Triassic vertebrate fauna from the upper 

 Red Beds of Wyoming, while Knight showed that the lower 

 portion of them were Permian. Herrick found Permian in- 

 vertebrates in the lower Red Beds of New Mexico. These 



45. Kan. Univ. Quart., VI, pp. 209, 210, 1897. 



