phenomena, the following are worthy of note. 

 Bathybia was a great depression some hun^ 

 dreds of miles across, bounded on the east by 

 a great fault face, but with more gently rising 

 boundaries in other directions. In fact it might 

 be likened to a portion, for example, of the 

 basis of the Pacific Ocean from which the water 

 had been removed. It seemed to us almost 

 certain that the earth's folding and faulting, 

 givmg place to this configuration, must have 

 taken place at a period corresponding to a 

 maximum phase of a great ice age, when the 

 Antarctic regions supported an ice^cap of 

 stupendous thickness. The ice must then have 

 played the role of rock when the great earth 

 movement referred to occurred. At a later 

 date, as the ice age passed away, ablation, 

 removing the ice strata, exposed the deep basin 

 of Bathybia. The lower portions of this basin, 

 situated below so great a thickness of atmo^ 

 sphere, was blanketed from the great cold of the 

 upper regions. To this end, also, the humidity 

 and increased abundance of carbon dioxide in 

 the atmosphere aided. Although in succeeding 

 times the highlands above were deeply buried 

 under snowfields, this deep plateau^locked basin 

 could keep its floor for the most part unencum^ 

 bered with water. The atmospheric circulation, 



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