42 ALASKA GLACIERS 



now, but our meager facts include nothing to indicate either 

 the date of their deposition or the date and manner of their 

 deformation. The overlying gravel and till are clearly of 

 glacial origin, and the gravel was laid down at or near sea- 

 level. As it is now about 150 feet above the sea, it is evident 

 that there has been a change here in the relation of land 

 and ocean. The buried tree trunks tell of an advance of 

 the glacier over a tract that had existed as dry land. 



FIG. 24. PUSH-MORAINE NEAR LA PEROUSE GLACIER. 



The glacier is out of sight at the left (compare fig. 23). The moraine, here 10 feet high, is 

 crowded against forest trees, and includes crushed trees. Photographed in June, 1899. 



The remnant of timber standing east of the stream val- 

 ley was separated from the glacier at the time of our visit, 

 by a belt of barren ground from 100 to 200 yards wide (fig. 

 23). This ground was occupied by bouldery till containing 

 bruised and macerated branches and trunk fragments, and 

 the margin of the timber showed unmistakable evidence 

 of recent attack by the ice (fig. 24). The till had been 



