178 
K. F. Mather 
are quite persistent, though they are seldom horizontal. The 
upper foot or foot and a half of the terrace is here composed of 
waterworked gravels and small bowlders of foreign rock, evidently 
of fluvio-glacial origin. 
A quarter of a mile farther up-stream, the terrace is thirty feet 
above the stream bed and here sands have been removed for mold- 
ing purposes. The surface is covered by rubble and debris up 
to sixteen feet above the stream bed, but above this point a good 
section is exposed. At the base (fig. 2) is a fine gray sand with 
an intricate crossbedded and laminated structure. Two feet 
higher the sand becomes yellowish and clayey; the length of the 
ripples is nearly double the length of those below and the sand is 
finer and retains its shape when molded in the hand. The fine 
laminae are accentuated by reddish, oxidized streaks, found only 
in this yellowish bed. This must mean that the oxidation took 
place during the deposition of the sand for only in that way could 
the lines of oxidation coincide with the lines of deposition. This 
deposit is five feet thick, and above it there is five feet of light 
yellow sand. The latter has occasional streaks of the gray sand 
found at the base of the section, but has nothing of the clayey char- 
acter of the sands directly beneath it. This bed is about the same 
in texture as that at the base and has the same stratification and 
lamination. The three beds of sand grade into each other, are 
loess-like, and contain only an occasional small pebble and no 
shells. The remaining three feet of the terrace above them con- 
sists of gravels quite sharply separated from the sands benearh 
by a nearly horizontal plane, and quite evidently of glacial or 
fluvio-glacial origin. 
Directly across the valley to the west of this section there is 
another place where sand has been carted away. The deposit 
here is similar to that in the upper and lower beds of the section 
just described. The cross-bedded structure is the same and its 
tendency to stand in vertical or even overhanging faces is also 
apparent. The upper surface of this deposit is ten to twelve feet 
above the surface of the terrace. It seems to fill the angle between 
the valley wall and the terrace surface and slopes upwards against 
the former. The whole deposit has the appearance of a fan spread- 
ing out from halfway up the valley wall and sloping down to the 
terrace level where it flattens out into the broad terrace. 
These fine sands in the composition of the terraces in the three 
