 | American Association for the Advancement of Science - 1860 - 462 páginas
...are very numerous and sharply defined. Proceeding southerly, a series of them occur in T. 31 N. R*. 17 E., about twenty miles north of the Oconto river,...surface. But the formation of a system of depressions, of an uniform character, over large tracts of country without natural mounds or ozars, is something quite... | |
 | American Association for the Advancement of Science - 1860 - 460 páginas
...the explerer frequently finds them so near together, that he no sooner rises out of one than he is obliged immediately to descend into another, the diameter...surface. But the formation of a system of depressions, of an uniform character, over large tracts of country without natural mounds or ozars, is something quite... | |
 | American Association for the Advancement of Science - 1860 - 464 páginas
...of oak orchards. Further north, in the thickly timbered country between the Fox and the AVissakote rivers, the cavities are filled with trees. Near the...undulations could be thus built up by gradual accretion aboce the general surface. But the formation of a system of depressions, of an uniform character, over... | |
 | 1860 - 452 páginas
...timber grows in them. While exploring the state, in 1849, it occurred to him that these cavities cannot be explained by the usual and well-known examples...aqueous deposits. Terraces and oblong ridges of sand and gravel might be formed by currents and eddies acting on loose material; but these are depressions... | |
 | 1860 - 448 páginas
...timber grows in them. While exploring the state, in 1819, it occurred to him that these cavities cannot be explained by the usual and well-known examples of aqueous deposits. Terraces anil oblong ridges of sand and gravel might be formed by currents and eddies acting on loose material;... | |
 | 1867 - 448 páginas
...timber grows in them. While exploring the state, in 1849, it occurred to him that these cavities cannot be explained by the usual and well-known examples...aqueous deposits. Terraces and oblong ridges of sand and gravel might be formed by currents and eddies acting on loose material; but these are depressions... | |
 | 1860 - 448 páginas
...timber grows in them. While exploring the state, in 1849, it occurred to him that these cavities cannot be explained by the usual and well-known examples...aqueous deposits. Terraces and oblong ridges of sand and gravel might be formed by currents and eddies acting on loose material; but these are depressions... | |
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NR 17 E., about twenty miles north of the Oconto river, the summits of the country being ~335 feet above Lake Michigan, and 913 feet above the ocean. Those on the dividing ridge between the waters of the west branch of the Oconto and the Wolf rivers,... 