a
a
a
a
a
a
a
a
a
S
A
M
P
L
E
S
I
T
E
C
F
F
F
A
A
T
T
T
T
T
T
T
H
H
H
Unconsolidated
gravel, sand, and silt
Gneiss and
igneous rock of
Precambrian age
from E. J. Crosby
, 1978
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