Iowa County democrat. [volume] (Mineral Point, Wis.) 1877-1938, 1879-12-05
NO. II.


spieuouSly rs ''toat" ON the borders
Of these crcvices for the southern
half Of the distance to the top,most
prairie, seems to be superseded, ut
the highest levels, by ochm and
clay.
That flint is u proper vciustone,
appertaining gcnotically to the MINI
eral crcviec, is what may have n
new sound But the writer has
seen it unmistakably occupying the
place of a vcinstonc in our rocks,
with iron pyrltes segregated upon
the opposite wall. And he holds
specimens of flint showing clearly
the medal line between the sides
which must have covered opposite
crcvicc walls; with thickly scattered
nodules, ut times, constituting
rudcly what is known Ms the comb.
form, ON the inner faces, This
is strongly marked in specimens
taken from the Lower Magnetism.
Pcrcival has this observation in
his 2d Geological Report, y, S5;
"rhc occurrence OF flint IN u cal
carious bed in the sandstone illus
tratcs the segrcgativo process by
which tliuts were formed in the
limestone As the contents of
mineral veins in general are by
him referred to tho same segrega-
tive process, ho may be claimed as
authority III support of the opinion
herein set forth MS TO flint being
vcinstonc.
But flint fills whole strata, as up
ON the top of West Bluo Mounds,
where the presence of our metallic
ores is unsuspeeted and its co-goner
quartzito, makes up the bulk OF
mountainous elevations in Sauk
county further to the northeast.
True, but all through, onwarads to
tho north eastern limits of the
State, we have Pereiyals support for
the opinion, like mineralizing con-
ditions,with those here shown, must
In ancient times, have prevailed.
What our present corps Of State
geologists call outliers merely Of
archaic rocks, standing insulated in
the midst Of later formations, Per-
cival intimates his belief, ure in
truth segregated mineral forma-
tions, as to their genesis, Of piece,
with formations eastward and with
the commercially important metal
lie deposits of Lead Region. See
ID Rep. p. II.
That this part Of the State pre-
scnts on example of M ancient
mountain ridge, now truncated, IL
will be rccollectcd, was the leading
idea Of Murrish's Geological Re
port. lie attached Importance TO
it for the proximity it promised Of
the igneous rocks.
If force is allowed to an express
sion of the great German naturalist,
Humboldt, to be met with in his
Aspects Of Nature, Art Volcanoes,
that crystals are the appurtenanccs
of mountains evolved by influences
special TO the spot, the abundant
presence in the Lead District of
zuartzose segregations, (lints) IL
linear arrangement such as CORES
ponds with our lines Of mineral,
might have been with good reason
adduced by Mr.. Murrish as n fact
corroborative Of his opinion.
IL is 10 be regretted that this es-
innate of the geological connection
of our Lead District with the
strongly marked mining regions OH
the north east, and others on the
southwest, as far Us the Ozark
Mountains, embracing the rich
mineral deposits Of Missouri and
, Kansas, should lave been disal-
lowed or, at least ignored, by those
having il recently in charge To pre-
pare the completed" geological
survey Of the State. And this de-
, ficiency seems attributable TO moth.
ing 80 cardinally as to the non
recognition on the part of our of
fetal scientists Of molecular segrc-
cation In obedience 10 some in