a “Geological Raitt the Chippewa Lond District 
* boundary of the gpological survey of 1839, as far as. : the: St. Pe: 
_, ° « ter’s river; and also a tract of country north of the. Wisconsin i 
Pe Tivers The pring streams which water it are Black pret pe e 
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part of the country bordering on the I a 
-~ 2. the chief part of the Winnebago reserve, the half 
= a strip of the Sioux country west of, and adjacent ta, the oem 
sippl, and reaching north to the St.- Peter 
t lies between 43° and 47° north sare and hit tween 89° 
and 94° of longitude west of Greenwich, pad mbraces. goat a 
forty-six thousand square miles of surface.” — ; 
* In addition to the general reconnoissance wade of the Shave Te- 
_ gion of country, a detailed survey was made of about thirty town- 
ships, west of the 4th P. M. on Black river’ in latitude 44° 30%, 
and about sixty townships on the St. Croix river in latitude 45°. 
_ other gentlemen of the corps at the most important points ote th 
Mississippi, and six on the St. Croix arranged in such a 
as to form a diagram of comparative heights, not only of the’ 
outline of the country, but also of the principal members of 
prevailing geological formations. One continuous section exte nds © 
from the mouth of the Wisconsin, where the survey of 1839 ter- 
minated, to the Falls of St. A nthon ny; one from the Mississippi . 
to the Falls of the St. Fie se one from the mouth of the St. © 
Croix to the Falls of St.sAnthony on a more extended scale than 
that appended to the general Mississippi section; one from Lake — 
Superior to Portage Lake ; one from the head waters of Wiston- 
sin river to the Dalles of that river; one from Lake Superior to 
the Falls of the St. Louis river ; one from Lake Superior along 
‘the 4th P. M. to Black river, and thence to the Mississippi; one 
ites. Croix. Also a particular section at the Falls of St. Anthony. 
- Diagrams of summit levels show the relative elevation of ground 
protwecn the Mississippi and Lake Superior in three different di- 
» Beearal of the above sections are so contrived with ladecape 
back ground, as to present not sat the natural exposure of eee 
- but also the general outline and appearance of “Eee untry 
se , ei which the sections run, 
