THE LAST ORE A T BALI IC GLA CIER 333 



must have been relatively thin, in consequence of which the 

 inequalities of the ground produced endless local divergences 

 from the general direction of ice flow."' The small sketch map 

 of the great Baltic Glacier given in my book is largely a repro- 

 duction of De Geer's map, published some years ago. Accord- 

 ing to Dr. Keilhack the line of union drawn from East Prussia 

 to Finland is "purely hypothetical and supported by no observa- 

 tions." Here, however, he is mistaken. Let him consult De 

 Geer's recent work, Oftt Skandinaviens geografiska Utveckling 

 efter Istiden," and he will find that a great terminal moraine, 

 marking the edge of the Baltic Glacier, traverses the islands of 

 Osel and Dago in a north-south direction, and can even be traced 

 for some distance on the bed of the sea. This can hardly be other 

 than a continuation of the terminal moraines (Salpausselka) at 

 Hango Head. 



Dr. Keilhack says he looks "for the easterly continuation of 

 the Baltic terminal moraine much further south, in the interior 

 of Russia." Well, it is never safe to prophesy, but I shall be 

 surprised if his anticipations prove correct. That much gravel 

 and sand and many erratics will be met with in the regions he 

 refers to I can well believe, but all these, I think, will be found 

 to be similar in character and age to the diluvial gravels, etc., 

 which overspread the bowlder clay in the lands to the south of 

 the Baltic Ridge. According to Dr. Vogt, of Christiania, with 

 whom Dr. Keilhack agrees, "the J-'lnnish terminal moraine 

 belongs with that of middle Sweden and Norway." On the 

 other hand, De Geer shows that the terminal moraines which 

 occur in Norway, somewhat south of Lake Mjosen, represent the 

 front of the Baltic Glacier during a stage in its retreat. He 

 traces the position occupied by the ice edge right across Sweden 

 in an easterly and northeasterly direction. The glacier is repre- 

 sented as filling the upper section of the Baltic basin and reach- 

 ing as far south only as Aland. The great gravel-ridge at 

 Hameenkanga, in the middle of western Finland, would appear 

 to be its terminal moraine in that country. This moraine occurs 



'Great Ice Age, 3d edit., p. 474. 



