260 Statement of Elevations in Wisconsin. 



Feet. 



Portage between Wisconsin and Neenah* rivers, . 801 ?f 

 Wisconsin river at Helena, ..... 748 ? 

 Top of Blue Mound, (1000 feet above Wisconsin at 



Helena, Locke,) 1748? 



Mississippi River, at mouth of Wisconsin, . . 686 ? 



Surface of Lake Superior, 596 



The geological character of this portion of the Territory is 

 very simple. The whole space from Lake Michigan to the 

 "mineral district," west of Rock river, and from the southern 

 extreme of Lake Michigan northward, nearly to the south line of 

 the "upper peninsula" of Michigan, is occupied (so far as is at 

 present 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, probably, to the " cliff limestone" of Dr. 

 Locke. It is not certain however, but that the "blue limestone" 

 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. 



* 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 Peres, ---------- 3-484 



Little Kakalin, 2 516 



Rapide de Croche, - - -'- - - - - - 1171 



Grand Kakalin, 44059 



Little Chute, 31000 



Grand Chute, 29 682 



Winnebago rapids, ....----- 7543 



Fall in the river between the rapids, (estimated) 40 miles, - - 40 545 



Fall in the river from Portage to Lake Winnebago, 126 miles, - 63 000 



Level of Lake Michigan, 578 000 



Total, 801000 



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. slates it at 1-5 

 feet ; which must be a typographical or a topographical error. 



