BY H. I. JENSEN. 



507 



Next, by comparing Lapparent's map showing the distribution 

 oi land and sea in the Carboniferous with figure 5, a much more 



Fig. 3. — Map of the World showing Distribution of Land and Sea in 

 the Jurassic (after Neumayr). 



Fig. 4. — Map of the World showing Distribution of Land and 5Sea in 

 the Cretaceous. Land shaded : sea unshaded; alkaline areas dotted. 



marked correspondence between the position of alkaline areas and 

 of Carboniferous shore-belts is noticed. 



