6 ~~ Geological Report onthe Chippewa Land District. ° vas 
+ tinctive peculiarities* can be observed ; the lower magihesiag| limes: 
“"*. stone has both in its upper and lower portion often oolitic beds’ 
saraineedtind it has occasionally green particles disseminated” 4 
__. through it, and on the whole is rather more soma and darker 
‘se 
+e 
«* 
‘colored. The only certain coahuide: however, 0 
which of these formations any given rock belongs, is te 
der of superposition ; or, still better, to determine the nature of the 
_«.,° imbedded organic remains, which differ materially in the ‘two. 
a the upper, is metalliferous, yielding both galena and: ‘copper ore sim- 
» bod . ilar to that found south in the Mineral Point District in the upper. 
_ “= magnesian limestone.t It appears, however, as yet a matter of 
doubt whether these ores will be found in as rich profusion in the 
northern part of Wisconsin as in the Mineral Point and Du. Baque 
Districts. 
The lower sandstones of the Upper Mississippi were “fotind’ to 
~ attain their greatest elevation and develouaeet a few miles below. 
Mountain Island, or, as it is known to the French Canadian, - 
“* Montagne qui trempe aVeau’t From Genes with some few . 
irregularities, as indicated by the diagram of comparative heights, 
* The paragraphs describing y a graphic manner the Fhe features of this 
magnesian limestone, are cited in ue Saat vol olum page 
_ + Inconfirmation of t of the ll xcod ike 6 aid insarked 
regardi 
gied in the hing cigs EF limestone of of se Mineral Point and Du Buque Districts 
Fe eH 
Months “an si aa 
dpeb' op) SET Ge ee ee Cy i eee “idee 
1 eee ee 4,080 | 80,125 | ...... 78,636 | 97,746 | 28,841 | 15,669 
MEM EM sare 6 dipie oe 91,296 | 65,Q80 | 73,449 | 82,787 |104,558 (126,073 | 8 1 
sgh ace oes 91,283 | 46,515 |122,294 | 89,982 | 983,628 |142,489 |119,89T | 
IRS cacao ais: ay 57,110 | 37,959 | 74,475 | 80,784 | 87,058 |113,209 {185,084 |- 
BETES (5 sac in, whee 58,820 | 54,436 | 77,333 | 66,699 | 68,153 | 83,559 110,383 
Cera rae 87,257 | 43,250 | 67,233 55,200 107,957 | 50,257 | 61,462 
ptember ..... 16,092 | 39,081 | 45,400 | 54,203 | 63,424 | 58,827 | 67,761 
ae 46,286 | 54,941 | 67,473 | 63,072 | 78,887 | 71,668 | 63,825 | — 
~ WNovember...... 50,640 | 26,472 | 38,734 | 53,288 | 71,767 | 54,291 | 65,873 | * 
: rent. el acca |) eee) weceee if wate 7500 |. 20 : 
[ep Total........ 452,814 (447,859 (561,321 |624,601 ia 460 730,714 \771,679 
_ {First arrival of | [3 
& steamboats ...|March 22 March 9)April 10|March 5 Feb. 26 March 10\March 29 
Last departure of | | [2 : 
steamboats ...|Nov’r. 22 Nov’. 16|Nov’r. 26|Nov’. 21, Nov’. 23 Dee. ee 
«e As a pig of lead will weigh, on an average, 70 poaeda it appears from the above 
. table that the annual produce has varied, in the last se ears, from nearly thirt 
ee ‘two millions, to ha, eatrdh of bare Son ur millions of poun 
+ Literally, the aici anind in the water. 
Pigs lead, | Pigs lead, | Pigs lead, | Pigs lead, | Pigs lead, | © | — 
1843, 1844. 1845. | 1846, 1847. 
