- charged with the same genera of shells, but of different species. 
4 * ig nt Se y ey , é ~ : 
S- . Geological Report on the Chippe 1 Ping District ‘ 
“ On the brink of the gorge, near Fort: Suelfing: no “fhiviatile: i 
remains have been yet found at a height where the. waters may 
“be supposed to have flowed in former times; but Dr. Shumard; - 
_ who was instructed to collect evidence of any ancient river. de- 
posits at a higher level, observed over the limestone at the he falls. 
a bed of drift of about eleven feet in thickness sting on. 
that, a bed of sand containing species of Cyclas, ‘Limnea, Physa 
and "Planorbis, and this deposit he traced on to the same: ‘level, 
for -nearky ~ a mile below the present position of the falls. 
h e gentleman also observed, half a mile below the 
falls, and rte a quarter of a mile east of the gorge, -on--rising 
ground over which runs the trail to St. Paul’s, a white marl ’ 
tance at least above the gorge; the latter seems to be a lacustrine 
deposit, the bottom of some drained lake, of which vege are nu- — 
merous instances in the Chippewa land district. 
“If we except these beds and the underlying drift, no forma-  ~ 
- tions of more recent date than the shell limestones of St. Pete r’s 
were observed along the Mississippi from the Wisconsin river to 
the Falls of St. Anthony. This statement will apply also to the 
country east of the Mississippi, as far as the water-shed between _ 
that stream and Lake Superior, Highs along the valley of the 
St. Croix above the falls.”—pp. 31, 
The 2d Chapter contains a description of the geological fotenae: 
fens of the Winnebago Reserve, a tract of country in Iowa lying 
between lat. 43° and 43° 30’, extending on the west side of the 
Mississippi as far as long. 93° 30’ Until the autumn of 1848 
the Winnebago Indians occupied this neutral gaat between the 
white settlements and the Sank and Foxes; when the former ~ 
tribe igs removed to the T'wo River country eve the Sank 
Rapi o 
The principal streams which water the Winnebago Reserve 
are: Turkey, Upper Iowa, and Red Cedar. It was along <e 
-* streams that the examinations were chiefly directed. 
$. 
rep . 
We learn from the report that along that part of Turkey river 
~ which meanders near the southern line of this Reserve tract, fos- 
- siliferous limestones, of the same age as those above the second 
terrace at Prairie du Chien, form low ledges crested with cedars 
‘and surmounted by a green slope from which the upper magne- 
‘sian limestone rises in fantastic shaped cliffs. 
"Ascending the same river to the Indian Agency and Fort Ata E 
__ kinson, the strata gradually rise. At the former locality, the ele- 
- vated ground usually presents a mural cliff of from fifty to sixty 
; 7 high, resting on table land, the elevation of which abov 
urkey river is about one hundred and forty feet. Here 
