MAN AND THE GLACIAL PERIOD. 



3 l 7 



hundred and twenty feet. Near the surface the well penetrated 

 a stratum of basalt, fifteen feet thick. Below this basalt there 

 were alternate beds of clay and quicksand to the depth mentioned, 

 where the sandstone rock was encountered. The well was tubed 

 with heavy iron tubing six inches in diameter, so that there could 

 be no mistake about the occurrence of the image at the depth 



Fig. 2. Edge View of the Preceding. 



stated. The detailed evidence was published by me in the Pro- 

 ceedings of the Boston Society of Natural History for January, 

 1890. During this last summer, also, I visited the locality and 

 found ample confirmation of it. 



In the valley between the Boise* and Snake Rivers, in south- 

 western Idaho, where Nampa is situated, there is an area of sev- 

 eral hundred square miles covered with fresh-appearing basalt, 

 which apparently came from vents thirty or forty miles to the 

 east, but in its western flow barely extended five miles beyond 

 Nampa. Below that point there is no lava for seventy miles. 

 The clay and quicksand covering the stratum in which the image 

 was found would seem to have accumulated in the valley of a 



