Grant County herald. [volume] (Lancaster, Wis.) 1850-1968, 1854-02-27
Water Courses.

Inc wafer, courses all follow denudet
valleys, formed by the action of the ele.
waiting and abrading forces, or balance d
the lead bearing rocks between these
two agents.
.Abrading Forces.
These forces have removed an amour,
Of superficial limestone from the surface
of the Lead Region, equal to strata Of
rock sixty miles square and two hun
dred feet thick.
Production Of .Jieta. ferrous Rocks.
In the Cornwell mining district, Eng.
igneous action protruded granite All.
through the states and limestomes, and a,
the junction of the stra,ified and linstfa.
Titled rocks is formed the mining fields.
In the Lake Superior mining district
axis of trap are prot ruded through-sant-
stones and at the junction, and by the
Iiiiterflision Of the sandstone and trap is
formed the mygdoloid or true copper
bearing rock. The metaliIerous rocks
of each Of these districts are formed in
vertical bands and follow the amiclinal
lines of trap and graniie--the veins have
a confined area and run to great depth
IN theLeadRegion on which am repor-
ting, the axis Of igneous rocks are sub
terranean, the OVERLAPPING beds of lime
stones and sandstones are probably "a
bout two thousand feet thick. These
rocks by the action Of elevating and a
brading forces, are formed in basins in
which the lead ores are deposited. Cod
we lift off these limestones and sand
stones of this district, we should find
ridges Of igneous rocks below the lines
OF rivers and their branches, and which
form the lines of disturbing forces and
anticlinal lines which divide the lead
bearing beds.
Fired LaUs to the Lead Veins.
lst. The anticlinal lines carry the out
crop, and the synclinal lines of axis the
central wealth of the lead bearing beds
I'd. East and west veins of lead ore
are only found where rocks No.
and 4 are IN place.
Sd. North and south sheets are only
found when rocks No: 2 and 4 are in
place. m
4th. Horizontal sheets of chunk ore
are only found where rocks and 4 are
an place.
9th. Horizontal sheets of lead ore, as
sociated with the sulphuret and carbon
ate OF zinc are only found in rccl, Nc. 4.
Fails.
The fats which traverse the Lead
Region are all fotfht! at the hattening out
OF lines of elevaiing forces !; and the up
throws or slips in the strata vary. from
70 fcsv7incfies up to a iiiIlscfeu rect IN
every ravine, valley and along the wa
ter courses, the strata are found 20 be
more or less uncomfortable.
East and W,st Creuices.
These crevices cut the central portion
Of the beds of rock in parallel lines gen.
orally about one hundred yards apart
The crevices found in the lead bearing
rocks are distinct from the falt or lines
Of axis.
NORTH and SoMh Creuices.
| These crevices are found in rock No.
2-and frequently occur in patches run
nirg in parallel lines few feet apart.
Quartering Creuices.
These crevices are found in rock No
2 and 3, generally in nests or patches.
.dges of The Lead Bearing Rocks.
lst Age. The lead bearing rocks have
evidently been formed by causes now in
action; the sandstores by the wearing
down Of GRANTEES and other igneous rocks
in the upper portion Of The Mississippi
valley the limestones were built up by
corals i'll the beds Of ancient seas.
| Sd Age. The district OF country which
now forms the Lead Region, in this age
is horizontal plain, in the bottom Of an
ancient sea or ocean. No valley, ridge
mound or wall OF table land had yet come
into existence.
Sd Age. The elevating forces COM
menced to upliit these >tratified beds oil
rock, and the abrading forces to weal
down the cracks formed in the upper
portion of the strata. The lines of for
ces branchtof from the Mississippi riv-
err, and fiatten out around centres.-
These centres resist tire atrading forces
from the fact of their not being distnr.
bed, and are now marked BY the mounds
and ridges oil the Lead Region.
/ 4th Age. The elevating and abradine
ferecs form the rocks in basins !; the cen.
trial portion OF these basins are tissuret
in parallel vertical lines, generally about
one hundred yards apart. The wall
rocks Of these assures, by vsItaic or 9th.
err agency, at the junction of rocks NO
| and 2 decompose land openings are for.
med. These openings are, BY aqueous
action filed with clay, sand, and peb.
bles /; basins on the surface OF the car
rock are gradually filled with deposites
of shale. Mas,odons are ento.nbed in
this era in the deep clays which sur.
round the mounds.
9th Age. The outlines Of ridges are
finished; spring branches commence to
radiate from the surface of the beds OF
shale, and break out by the Artesian
force from the various basins of rock
The lead producing action deposi.es ores
IN the cfayey matrix of the openings, and
caves, and iii the clays ON the surface OF
The rocks. The ores found in rock No.
| and 2 give evidence of being first for
med. The lead producing action proba-
biy being active while the lead bearing