228 
The American Geologist. 
April, 1893 
evideiitl}' the ivjects of blade-makinji;. I had for three years 
been familiar with identical quartz shop-refuse. These articles 
were embedded in rather loose heterogeneous gravels and though 
confined to a prett}' uniform level below, resting upon a bed of 
sand, they extended upward to the surface of the slope. They 
were distributed somewhat generally throughout the mass, although 
a slight appearance of clustering was at times noticeable. As we 
penetrated farther the fragments became less numerous and in- 
cluded fewer large pieces. Having advanced about twenty feet 
on a line nearh' parallel with the north bank of the roadway the 
formations began to change their appearance at the base and it 
soon became apparent that we had reached the limit of the het- 
erogeneous quartz-bearing deposits, here some five feet deep, and 
were encountering homogeneous undisturbed strata, the separa- 
Fig. 2. General .section of terrace niargin. Babbitt site, sliowins; bedded gravels and, 
quartz-bearing talus, the black angular figures representing tlie artificial material. 
tion being, however, quite indefinite. There was a somewhat 
gradual change of color and composition; from dark heterogene- 
ous materials there was a gradation through mottled, mixed 
materials to 3'ellowish, homogeneous, gravelly sands. The sur- 
face or front of these sands, referred to usually as gravels, rose 
at a high angle, and at thirty- feet advance in the trench the 
superficial quartz-containing deposit had, from five feet deep at 
the 22d foot, thinned out to eighteen inches. The section pre- 
sented in fig. 2. was drawn with great care and represents the 
genei-al conditions with all necessary accurac}' and without distor- 
tion of scale. 
The phenomena of the front surface of the normal gravels as 
exposed in the trench were very instructive. There had been 
considerable disturbance by cracking and sinking, especialh- on. 
