296 C. A. SUSSMILCH AND T. W. E. DAVID. 



extra-Australian areas, of the remarkable glacial pheno- 

 mena of the Kuttung series. From the last point of view 

 five areas at once suggest themselves for comparison— three 

 in U.S.A., one in France, and one in Germany. 



2. Analogues in U.S.A. 



(i) Probable glacial evidences in the Caney Shales (Middle 

 Carboniferous) near Oklahoma, U.S.A. 



A very interesting possible analogue to the Middle Car- 

 boniferous (Kuttung) glacial beds described in this paper is 

 to be found in the Caney Shales, Oklahoma, U.S.A. 1 



The Caney shales are seen in the Arbuckle and Ouachita 

 Mountains, in the central parts of the Choctaw and Chic- 

 kasaw nations respectively. Their maximum thickness is 

 1,000 feet. They are mostly black and blue marine argil- 

 lites passing locally into sandstone, and are considered to 

 be on the horizon of the Pottsville Conglomerate of which 

 the European equivalents are the Millstone Grit, "I'etage 

 infra houiller," "Flotzleerer Sanstein," etc. Tail originally 

 described boulders considered to exhibit glacial striae from 

 these beds. 2 



Dr. E. O. Ulrich who collaborated with Taff in examining 

 these boulders, writes: — 



"The assumption of locally frigid conditions in the early 

 Pennsylvanian is based primarily on the fact that erratics of all 

 sizes, some as much as 20 feet across and 5 or 6 feet thick occur 

 in the Caney Shale of Eastern Oklahoma. These erratics, mostly 

 formed of Ordovician limestone, were transported not less than 50 

 miles, and many probably were carried much farther. No other 

 competent means of their transportation than ice— presumably 

 heavy shore ice— has been suggested." 



1 Bull. Geol. Soc. America, Vol. 23, pp. 457-462, Pis. 23, 24. 1912. 

 Boulder beds of the Caney Shales at Talihina, Oklahoma, by J. B. Wood- 

 worth. 



a Bull. Geol. Soc. America, Vol. 20, 1908, pp. 701, 702. Ice-borne 

 boulder deposits in Mid-Carboniferous Shales, by Joseph A. Taff. 



