676 



DYNAMICAL GEOLOGY. 



(Fig. 1100) represents the Mt. Blanc glacier-region, excepting a 

 small part at its southwestern extremity. The vale of Chamouni 

 along the river Arve bounds it on the northwest, and the valley of 



Figs. 1100-1104. 



Fig. 1100. — Part of the glacier-district of Mt. Blanc, the lighter middle portion of the map six- 

 teen miles long, out of twenty-two miles the whole length ; river on the northwest side, the Arve, 

 in the valley of Chamouni, and that on the southeast side, the B-oire ; B, Mt. Blanc ; G, Aiguille 

 du Geant; J, the Jardin ; T. Aig. du Tour; V, Aig. Verte ; a, Argentiere Glacier; ba, Brenva 

 Gl. ; bn, Bossons Gl. ; bs, Bois Gl. ; g, Geant or Tacul Gl. ; I, Lechaud Gl. ; m, Mer de Glace, up- 

 per part of the Bois fiU. ; mg, Miage Gl. ; ta, Talefre Gl. ; tr, Tour Gl. ; «, Trient Gl. 



Fig. 1101. —Section of the Mer de Glace, near m of Fig. 1100, or opposite Trelaporte ; 1102, sec- 

 tion of same, near bs of Fig. 1100, or opposite Montauvert ; 1103, View of the Rhone Glacier ; 1104, 

 profile of same, c, c, etc., being the transverse crevasses, fading out, and becoming curved after 

 passing the cascade at m n . 



