Mineral Point tribune. (Mineral Point, Wis.) 1869-1938, 1900-05-17

OF at least the finer parts, were
handled by the waves of the shallow
waters, for they we're mi first shallow,
and assorted and re-distributed. Thus
the residuary products on the sub
merged surface, were one source of
sediments. From the shores also, so
long as land areas remained, the
waves derived sediments. These were
composed in part OF the weathered
products of the rock, and in part of
the undecomposed rock against which
the waves beat. after the loose ma
terilis had been worn away These
sediments derived from the shore were
shifted, and finally mingled with those
derived from the submerged surface.
So long as any part OF the older land
remained above the water its streams
brought sediments to the sea These
also were shifted by the waves and
shore currents and finally deposited
with the others on the eroded surface
of the quart2ite. Thus sediments de-
rived In various ways, but inherently
essentially similar, entered into the
new formation. The first material to
quartzite as 1t was submerged, was
TIE coarsest part of the sediment. OF
the sediment derived by the waves
from the coasts and brought down to
the sea by rivers, the coarsest would
at each stage be left nearest the shore
while the finer was carried progress
lively farther and farther from It,
Thus at each stage the sand was de-
posted farther from the shore than
the gravel, and the mud farther than
the sand, where the water was so deep
that the bottom was subject to little
agitation by waves. The theoretical
distribution of sediments about an
island as 1t was depressed, Is illustrat-
ed by the following diagrams, Figs. 7
and s, 1t will be seen that the surface
of the quartzite is Immediately over
lain by conglomerate, but that the
conglomerate near its top is younger
than that near it's base"
In conformity with this natural
distribution of sediments, the basal
beds Of the qotsdam formation are
often cOnglomeratic. Gig. 81. This
may oftenest be seen near the quartz
ite ridges. for here only Is the base OF
thd formation commonly exposed.
rhe pebbles and larger masses of the
cOnglOmerate are quartzlte like that
Of the adjacent beds, and demonstrate
the source Of at least some OF the ma
the pebbles and powders are Of
quartzite Is significant for il shows
that the older formation had been
changed from sandstone TO quartzite,
before the deposition OF the Potsdam
sediments. The sand associated with
the pebbles may well have come from
tho breaking up OF the qu4rtzite,
though some Of il may have been
washed in from other sources by the
waers in which tho deposition took
place The basal couglOmerate may
be seen at many places, but nowhere
about DEVILS lake is IL so well exposed
as at parfreys glen, where the round
Cd stones Of which ii is composed g2ry
from pebbles the size OF pea. TO
powders more than three feet In d.
ameter. Other localities whore the
c0nglOmerate may be seen to adyan-
tage are Forwards glen, the east bluff
at Devils lake Just above the GIN
house, and at the upper narrows Of
the BarabOo. above Ablemans"
Tie main quartzite range three
miles north Of BaraboO, has a general
east-we8t trend, and rises with bold
andsome times PERCEPTIONS slopes 500
70 500 feet above It's surroundings. a
doom gap three Or four mllna alnlh ~