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



Tuburao Series is Upper Carboniferous. It may be suggested 

 that the tillites at any rate, and perhaps the Gangamopteris 

 obovata beds which conformably succeed them may be of 

 Uralian (Upper Carboniferous) Age. There can be little 

 doubt that these South American tillites are the equivalents 

 of the Dwyka tillites of South Africa. 



The thickness of these sandy tillites with thin intercal- 

 ated shales is, at Capivary and Imbaiatuba from 2000 to 

 nearly 3000 feet. Near the Rio Negro Dr. Woodworth (op+ 

 cit.,p.68) records a marine fauna intercalated in the tillites, 

 but does not give details of the fauna. He considers that 

 there were at least two distinct phases of the glaciation. 



9. The Falkland Islands. — T. G. Halle 1 has described 

 boulder beds at the base of the Permo-Carboniferous rocks 

 on East Falkland Island. The overlying strata contain 

 Gangamopteris, Glossopteris and Phyllotheca. 



10. North America. — Reference has already been made 

 earlier in this paper to the Squantum tillite, the Roxbury 

 conglomerates of the Boston to Narragansett Bay areas, 

 the conclusion provisionally deduced being that they are 

 probably Stephanian (Uralian) in age. The Guadalupian 

 Fauna of Texas, so excellently described by G. H. Girty 2 is 

 obviously high up in the Permian. It contains Richthofenia 

 Leptodus (Lyttonia), Medlicottia, Foordiceras etc. (See 

 Plate XXX). 



11. Europe. — (a) England. —Sir Andrew Ramsay 3 was of 

 opinion that glaciated pebbles occurred in the Permian 

 Breccias of England. There is, however, some doubt as to 

 whether these scratches are really of glacial origin. 



1 Bull. Geol. Inst. Univ. Upsala, 1912, 11, pp. 115-229. 



2 U.S. Geol. Sur. Prof. Paper 58, Washington. 



3 Q.J.G.S., 1885, pp. 185-205. 



