370 E. M. Deeley — Flow of Antarctic Ice. 



often absent and then the fissile limestone h conies to rest directly 

 upon the limestone numbered 1. A compound bed is the result, the 

 upper portion of which belongs to the Lower Lias, and the lower 

 to the underlying Rhsetic Series. Since the upper portion has yielded 

 Psiloceras planorbis on the testimony of both Wilson and Quilter and 

 Mr. Montagu Browne, it is obvious that it belongs to the Planorhis- 

 Zone. Wilson and Quilter regard the lower portion as the top-bed 

 of the Upper Ehsetic ; but Mr. Montagu Browne would claim it as 

 belonging to the " Liassic Basement Beds = Sub-Lias = Osifri^ff-Zone " 

 (p. 37). On an earlier page he says that this "Sub-Lias" is the 

 "White Lias" of some authors, which would lead one to suppose 

 that some authors have used the terms " Osi!rm-Beds" and " White 

 Lias " synonymously ; but I am not aware of any such confusion. 

 Mr. Montagu Browne further states that here and there embedded 

 in the lower portion of the inferior part of the compound bed referred 

 to above are nodules that may represent the Gotham Marble. If such 

 is the case, then the limestone -band that is overlaid by a limestone- 

 bed of planorbis hemera and underlaid by nodules on the horizon 

 of the Gotham Marble occupies the stratigraphical position of the 

 Osirea-Beds, Insect and Grustacean Beds, and White Lias of Mid 

 Somerset. The lithic and faunal characters of the bed, however, do 

 not point to contemporaneity with either the Ostrea-'Beds or Insect 

 and Crustacean Beds, and until the presence of a representative of the 

 Gotham Marble has been more satisfactorily demonstrated, I should 

 prefer to regard the limestone in question, which usually separates 

 into two layers, as comparable with the Fseudomonotis-Bed of Garden 

 Gliff, which also admits of similar dual division. 



The closeness of deposits containing Psiloceras planorbis to undoubted 

 Rhsetic Beds is very interesting, and the difference in fauna is readily 

 explained by the magnitude of the non-sequence. 



One of the main objects of this communication is to state or 

 emphasize the point that the marls of the Upper Rhsetic are not — 

 as supposed in 1884 by Wilson and Quilter, and in 1908 by Mr. C. 

 Pox-Strangways — an argillaceous development of the White Lias of 

 Somerset, and therefore of the same age. Mr. Montagu Browne 

 noticed that these Upper-Ehsetic marls of Wigston were represented 

 at Aust Clilf , and records that he convinced his friend Edward Wilson 

 of the fact. The Upper-Ehsetic is indeed a most persistent deposit, 

 quite distinct from the White Lias where the White Lias is developed, 

 and everywhere underlying it. 



VIII. — The Flow of Antaectic Ice. 

 By E. M. Deeley, F.G.S. 



IN his interesting and excellent Voijage of the Discovery Gaptain E. F. 

 Scott speculates on the former ice conditions of the Eoss Sea and 

 the adjacent ice formations. He regards the views he expresses on 

 this subject as only speculations, so I trust that I shall not be 

 considered ungenerous if I attempt to express what I understand 



