. Report of a geological survey of Wisconsin, Iowa, and Minnesota : and incidentally of a portion of Nebraska Territory : made under instructions from the United States Treasury Department . Peres, in St. Louis are, in fact, outliers of the Illinois coal-field. From the Missouri River the boundary bears, witha westerly curve, up the valley of the Osage, north of that river, which it crosses, but for a very limiteddistance only, at three points: in Camden County, near the mouth of the Niangua; in St. Clair County,near the mouth of Sac River; and in Bates County, near the confluence
. Report of a geological survey of Wisconsin, Iowa, and Minnesota : and incidentally of a portion of Nebraska Territory : made under instructions from the United States Treasury Department . Peres, in St. Louis are, in fact, outliers of the Illinois coal-field. From the Missouri River the boundary bears, witha westerly curve, up the valley of the Osage, north of that river, which it crosses, but for a very limiteddistance only, at three points: in Camden County, near the mouth of the Niangua; in St. Clair County,near the mouth of Sac River; and in Bates County, near the confluence with the main river of the LittleOsage. Thence the line bears, with a northerly curve, towards the western confines of Fayette, recrossingthe Missouri at Wellington ; thence up the valley of that river, keeping from ten to twenty-five milesfrom the river, to the State line. 100 CA11BONIFEKOUS LIMESTONES OP IOWA. ever, for a short distance, on the Upper Rapids of the Mississippi, charged withPecopteris (Table VI. Fig. 7), and other fossil plants. On these Rapids, near the headof Smiths Island, the carboniferous rocks finally give place to Magnesian Lime-stones of Upper Silurian CONCRETIONS IN CAEBONIFEK OUS SANDSTONE, MUSCATINE. SECTION V. THEIR PHYSICAL AND AGRICULTURAL CHARACTER. The carboniferous rocks of Iowa occupy a region of country, which, taken as awhole, is one of the most fertile in the United States. No country can present tothe farmer greater facilities for subduing, in a short time, wild land. Its nativeprairies are fields, almost ready made to his hands. Its rich, black soil, scarcelyless productive than that of the Cedar Valley, returns him reward for his labour ahundred-fold. The only drawback to its productiveness is that, on some of thehigher grounds, the soil, partaking of the mixed character common to drift soils, isoccasionally gravelly; and that, here and there, where the upper members of the;coal-measures prevail, it becomes somewhat too siliceous
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