260 Statement of Elevations in Wisconsin. 
Feet. 
Portage between Wisconsin Neenah* rivers, . 801 + 
Wisconsin river at Helena, . . , F ‘ 748? 
Top of Blue Mound, (1000 f bove Wisconsin at 
Helena, Locke,)_ . a =x oh ee 
Mississippi River, at mouth 2, Wisco ‘ 686? 
596 
‘Surface of Lake Superior, . . 
this n of the "Territory is 
very simple. The whole space fr La % al le 
“mineral district,” west of Rock river, and from the southern 
sent known,) by one vast bed of limestone, disposed in nearly 
horizontal layers, of a light color, and nearly destitute of organic 
remains. It is referable, eee to the ‘cliff limestone” of Dr. 
Locke. It is not certain however, but that the “blue limestone” f 
may be found within this district, and also the “ Archimedes — 
limestone” of Mr. Owen, but the limited knowledge we have of 
this great calcareous deposite, does not allow of a decision on 
these points. bi 
* Or “ Fox river of Green Bay.” 
t This estimate is based upon the survey of the Neenah and Wisconsin rivers, 
by Capt. T. J. Cram of the U. S. Engineers, who accurately leveled the several 
rapids below Lake Winnebago, and reports them as follows :— 
Feet. 
Rapide des Péres, - - - ° - ¥ é - - a 3-484 
Little Kakalin, - ~ % : a » = ia 2516 
Rapide de Croche, - - - - - - - - - 117k, a 
Grand Kakalin, - - - 2 < Bs w f = - 44059 —3 
Little Chute, - - - - - : Ps & P - 31-000 
Grand Chute, : - * > " ‘ “ * . - 29-682 
Winnebago rapi ids, “ ~ : 7-543 
Fall in the river between ‘De ailla, (estimated) 40 ‘aa - - 40545 
Fall in the river from Portage to Lake Winnebago, 126 miles, - 63000 
Level of Lake Michigan, i ee 
Toul. ls ee ee ee a 
This note is made to correct an error of Mr. Higgins, (Geological Report of Mi- 
chigan, 1838—9, pp. 49, 50,) where the elevation of this portage is stated at only 
121 feet above Lake Michigan, (699 above the ocean,) which error is quoted by 
Mr. Whittlesey in the article referred to. The principal error is in the descent of 
the Little Chute, which Capt. Cram found to be 31 feet, but Mr, H. states it at ge 
feet ; which must be a typographical or a topographical error, 
