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Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume V (1877-1881)

Swezey, G. D.
On some points in the geology of the region about Beloit,   pp. 194-204 ff. PDF (2.6 MB)


Page 194


1{04   Wisconsin Academy of Sciences, Arts, and Letters.
ON SOME POINTS IN THE GEOLOGY OF THE REGION
                     ABOUT BELOIT.
                        By G. D. SWEZEY.
  Along the line of hills which forms the western boundary of
the Rock river bottoms at Beloit are exposed at frequent intervals
the outcropping edges of rock strata; these include the upper
layers of the St. Peters sandstone, the whole or nearly the wholte
thickness of the Trenton limestone, and the lower layers of the
Galena limestone.
  The Trenton limestone, which consequently most intereE
today, is a formation which presents so much variation in
logical characters, and to some extent in fossils, that it is r
divisible into a large number of distinct subdivisions, whose
acters are so well marked that they can in most cases be i
fled with ease, and sufficiently persistent, at least over th
miles of extent with which we have to do, so that they cl
matched with a good degree of certainty ; there is scarcely
posure of any extent in the region of whose place in the Ti
section we have any doubt. Moreover it happens that o f tl
hundred and eleven feet of Trenton limestone, we have ex
in one or more outcrops of the region, every layer unless i
few feet in the horizon of the Upper Blue.
  The subdivisions of our Trenton rock and their exposure
various quarries and outcrops of the region are shown up(
chart; the names of the quarries are given as they are fami
known by us at B-loit. Between the St. Peters sandstone
the Trenton limestone are eight feet or perhaps more of i
tional layers; they include at the bottom a foot or so of
stone, more coarse and impure than is usual with the St. I
above this five feet of impure limestone and shale, and at tl
two feet more of coarse sandstone.  Above these transi
layers we have twenty-two feet of Lower Buff limestone
arated by well marked shaly seams at least, if not by lithol
characters, into three or four subdivisions, everywhere recogn
I


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