= ‘The report i is also, ioanied by a pravisional geological chart 
~.. showing the. approximate boundaries of formatio lons; and b 
The ‘ology pf the district is described under the following 
ad 
es ‘Kaliskions of the Upper Mississippi. * 
OBE ‘Formations: of Red Cedar river and the eae reserve. 
“wiper to: Jeatding results. 
“Tee appears that the Upper Mississippi country north of the Wis. 
consin Tiver’to within a short distance of the mouth of the St. 
- Peter’s, ‘is based on the magnesian limestones and sandstones older 
han: the lowest of the formations of the valley of the Ohio; a 
and Potsdam sandstone of the New York survey. 
= The: portion of the report relating to these formations, which’ 
“ ‘read with peculiar interest, is that which relates to the fos- 
© siliferous beds of these formations, since hitherto they have ae” 
oe regarded as almost barren of organic r ’ 
The results of this survey seem to mast that it is to this por- 
j a tion of the United States ae we must look to throw most light 
; on the earliest organic form 
this subject we find on | page 14 the following he a 
*, ei we except the white sandstone the terminating mass of F’. 
<a e,* the one upon which the lowert magnesian limestone (F’. 2 
_ tests, nothing definite was known up-to the period of the present 
and thas to furnish, not only to the geologist, a key to the strat- 
al peetion of the rocks north of the Wisconsin river, but, 
same time, to the miner his surest and safest guide by — 
1 to direct operations in the search after mineral wealth. 
oy oe ey xe “of Wisconsin mand prt of Twa gm: i 3 
eras sketches exhibiting the geological features of the : 
30K “ormations of the interior of the Chippewa Land’ District. 
_ 4."Formations of Lake Superior. 
b 4 Wy ae 
In,Our not! ee of these: topics we must necessarily confine rie 
“portion of them being cotemporaneous with the calciferous group ra 
go> 
Mveak: <a at the —. of the — river. 
upper magnes ep 2 R: the lead bearing rock of 
PBs int. Se am of 1839 
Ry 
« “7th = 
is 
og 
p, 
i 
£3 
Es 
