PENNSYLVANIAN-PERMIAN GLACIATION 489 



Wichita Mountains, as well as in more distant localities, as Massa- 

 chusetts, certain deposits, the origin of which is much more reason- 

 ably ascribed to glaciation than to any other agency. It is, of 

 course, now generally accepted by geologists that extensive glacial 

 deposits were formed on all of the continents, except North America, 

 during Carboniferous times. This fact, however, should not be 

 given undue weight in support of the view that particular glacial- 

 like deposits are necessarily of glacial origin because they were 

 formed in the Permo-Carboniferous times. The character of the 

 deposits and associated features themselves should furnish reason- 

 able evidence of their glacial origin, if such is their origin. 



However, marked changes in cKmate are known to be world wide 

 in their effects and it would seem highly probable that if Permo- 

 Carboniferous glaciation did so powerfully affect the other conti- 

 nents, such as Asia,^ Australia,^ Africa,^ and South America-* in par- 

 ticular, it should almost certainly have affected North America over 

 considerable areas. If this were the case, such regions as the Ar- 

 buckle Mountains and the Wichita Mountains, which stood as high 

 land areas during this period of general glaciation, would have been 

 so situated that glaciation might reasonably be expected to have 

 developed there. 



' For an account of Paleozoic glacial phenoinena, see C. D. White, "Carboniferous 

 Glaciation in the Southern and Eastern Hemispheres," Am. Geol., Vol. XIII (1889), 

 pp. 299-332. 



= W. E. David, Q.J.G.S., Vol. LII (1896), pp. 289-301. 



3 Broom, Geology of Cape Colony. 



4 1. C. White, Geol. Soc. Am., Vol. IX, pp. 512-21. 



