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abundant beds Big Sioux blue bluffs bowlders brick Carboniferous chert clay coal common crevice Dakota deposits depth Dickinson county dolomite drainage Dubuque county east Eldora erosion exposed exposures formation forms fossils Galena Galena limestone Geol Geological glacial groves Hardin county hills inches indurated rocks Iowa Falls Iowa river Iowan drift Kansan drift Kinderhook layers ledges less Lime creek limestone loess lower Lyon and Sioux Lyon county Maquoketa material miles mineral mines moraine northern northwest occurs Okoboji Osceola Osceola county oxide places plain plants Pleistocene portion prairie present quarry quartzite region ridge sand sandstone shaft shale sheet Shell Rock river Sioux counties slopes soil South Fork species Steamboat Rock stone strata stream surface Survey terrace thin tion topography township trees Trenton tributaries upper valley weathered western White Wisconsin Wisconsin drift wood Worth county zinc
Page 480 - Indian women and old men, who display a degree of perseverance and industry which is deserving of commendation. When a quantity of ore has been gotten out it is carried in baskets by the women to the banks of the Mississippi and then ferried over in canoes to the island, where it is purchased by the traders at the rate of $2 for 120 pounds, payable in goods.
Page 431 - Orthoceras bed; light brown, earthy, nonlaminated, rather hard layer, which some writers have described as limestone; not very calcerous; crowded with shells of Orthoceras sociale, which are generally crushed and otherwise imperfect, some of the partially decomposed shells still retaining the original nacreous luster 1 1,3. Fissile, slaty shale, dark gray in color, containing many blade-like or sheath-like impressions of Spatiopora iowensis Ulrich 6 12.
Page 481 - At the close of the Black Hawk war the large tract known as the Black Hawk purchase, including one-third of the present area of Iowa, was ceded to the United States by the Sacs and Foxes. After the completion of the treaty negotiations the miners again crossed over into the coveted region, where they built cabins and commenced to take out much ore. But a second time they were forced to leave because the treaty had not been ratified. In June, 1833, the treaty went into effect and the way was at length...
Page 538 - ... feet wide, the sides and roof arched in an irregular manner. Probably it extends in this oval shape to a depth equal to the clear space above. The whole appears to have been ceiled with lead; and although its size is not as great as that of many (?) other mineral caves, the amount of galena in view at one time is said to exceed that of any 'pocket
Page 485 - Having made certain investigations in the region in the course of private professional work, he gave a very accurate though brief account of the mines. His ideas were later elaborated in the course of his work for the three States, Iowa, Wisconsin, and Illinois, for which he successively studied the field. In his reports he covered the whole ground excellently, and it is no disparagement to others to say that together they form the most complete account of the field yet published.?
Page 478 - polite but evasive " and did not visit the mines, although there is an interesting statement, signed by Dubuque and Pike in 1805, in which it is declared that 20,000 to 40,000 pounds of lead were made per annum, that being a yield of 75 per cent. It is also stated that copper had at that time been noticed, although no attempt had been made to reduce it. After Dubuque's death the Indians burned his house and fences and destroyed all traces of civilized life. They continued, however, to work the mines...
Page 481 - ... by which we as miners will be governed, and having duly considered the subject, do unanimously agree that we will be governed by the regulations on the east side of the Mississippi River,* with the following exceptions, to wit : ARTICLE I. That each and every man shall hold 200 yards square of ground by working said ground one day in six.
Page 424 - Dolomit zation is imperfect. The layers range from 3 to 10 or 12 inches in thickness, the thicker beds being near the base and the layers becoming progressively thinner toward the top. Shaly partings between the strata are more common in this division than elsewhere in the formation. The thickness of the bands of shale in the upper part become equal, indeed, to the thickness of the alternating layers of limestone. As a matter of fact the limestone in the very upper part is not infrequently reduced...
Page 186 - Moines ; that within fifteen leagues of that river it passes through a large lake nearly sixty miles in circumference, and divided into two parts by rocks, which approach each other very closely : its width is various; it contains many islands, and is known by the name of Lac d'Esprit. It is near the Dog Plains, and within four days
Page 479 - Mine au Fevre," the former the prototype of the Wisconsin mines and the latter the earliest workings at Galena. What are known as the Durango diggings, then passed under the name of the Mine of Maquanquit'ons. Schoolcraft's description, the first which we have of the mines of Dubuque proper, is as follows: The district...