140 ■ The American Geologist. m^^'^^^- ^^^^ 
regard to the deposits in the mine and have been given an 
opportunity to examine the locahty more carefully than forili- 
erly. The result has been, to my surprise and gratification, 
the discovery that the Union Creek glacier once extended to 
and covered the site of the Nash mine and that the tusks were 
found embedded in on old soil formed at the surface of a gla- 
cial till. Incidentally, evidence was gathered of two stages 
in the glaciation of this region and to give others the oppor- 
tunity of judging of its value is the object of this paper. 
THE FOSSILS. 
The first tusk, when found, was intact, but was broken into 
a number of pieces in the process of removing it from the 
matrix. These were placed in nearly their refative positions 
and photographed. No means were taken to preserve the tusk 
and it has long since fallen to pieces and' disappeared. Its 
length was about six feet. In cross-section at the thickest 
place, it was about nine inches from top to bottom and .about 
eight inches in width. The sides were flattened. It gradually 
tapered until near the smaller end which was more than ordin- 
arily blunt from wearing. It curved upward until near the 
smaller end which was bent to one side, presumably outward. 
It was hollow for about i8 inches from the larger end. In- 
ternally, it was concentrically laminated. The material was 
a soft, fine, whitish, greasy substance — partly decayed ivoiy. 
The photograph and a small fragment of the tusk were 
suijmitted to Mr. William Sinclair of the State University of 
California, the Pacific Coast expert on fossils of this class, 
who considers it fairly certain, from the curvature and the 
internal structure (not the lamination above mentioned) that 
the animal was an elephant, Elephas primigcnins. 
The second tusk was similar to the first except that it was 
slightly smaller. Aleans were found to preserve a portion of 
it. The three-foot section now remaining has a curvature of 
nearly 90°. Disregarding the difi^erence in size, I am strongly 
inclined to consider both tusks as remains of the same animal. 
They were found in the same section of the mine and no other 
tusks were found there or anywhere else in the mine. As- 
sociated with tliese tusks were bunches of a whitish, rotten 
substance, apparently remains of the bones. To facilitate the 
