134: 



MAN AND THE GLACIAL PERIOD. 



and northeastward of the lake, reaching in the latter di- 

 rection Ulm, upon the Danube — the whole distance of the 

 movement being more than one hundred and fifty miles. 

 Through other valleys tributary to the Danube, glaciers 

 descended upon the upper plains of Bavaria, from the 

 Tyrolese Alps to the vicinity of Munich. From Gross 

 Glockner as a centre in the Noric Alps, vast rivers of ice, 

 of which the Pasterzen Glacier is the remnant, poured 

 far down into the valleys of the Inn and the Enns on 

 the north and into that of the Drave on the southeast. 

 Farther eastward in this part of Europe the mountains 

 seem to have been too low to have furnished centres for 

 any general dispersion of glacial ice. 



Upon the south side of the Alps the ancient glaciers 

 spread far out upon the plains of Lombardy, where mo- 

 raines of vast extent 

 and of every descrip- 

 tion enable the stu- 

 dent to determine the 

 exact limits of the 

 ancient ice - action. 

 From the southern 

 flanks of Mont Blanc 

 and Monte Kosa, and 

 from the snow-fields 

 of the western Alps, 

 glaciers of great vol- 

 ume descended into 

 the valley of Dora 

 Baltea (vale of Aos- 

 ta), and on emerging 



Fig. 41. — Map showing the Lines of Debris ex- ' . 



tending from the Alps into the Plains of the from the mountain 

 Po (after Lyell). A. Crest of the Alpine wa- 

 ter-shed ; B, Neve fields of the ancient gla- valley Spread Ollt OVer 

 ciers ; C, Moraines of ancient glaciers. . , 



the plains around 

 Ivrea, leaving moraine hills in some instances 1,500 feet in 

 height. The total length of this glacier was as much as 



