 Large bowlders are frequently met with in the bottom of the ravines and streams, but are seldom seen in other localities. Occasionally a ravine will be fairly filled with these bowlders as is notably the case with one in Tp. 75 N., R. XX W.,Se. i of Se....  Annual Report for ... with Accompanying Papers - Seite 158von Iowa Geological Survey - 1901Vollansicht - Über dieses Buch
 | 1901 - 582 Seiten
...feet. The fossils appear very prominently on the weathered surface. Pleistocene. THE KANSAN DHIFT. The drift of Marion county is that formed by the Kansan...term ferretto.* •Proc. Iowa Acad. Sci. , Vol. V, 1897, pp. 90. It varies in thickness from six to twenty inches, but has perhaps an average of about... | |
 | Iowa Geological Survey - 1901 - 598 Seiten
...glaciated pebbles. Large bowlders are frequently met with in the bottom of the ravines and streams, bub are seldom seen in other localities. Occasionally...term ferretto.* •Proc. Iowa Acad. Sci. , Vol. V, 1897, pp. 90. It varies in thickness from six to twenty inches, but has perhaps an average of about... | |
 | United States. Bureau of Soils, Milton Whitney - 1904 - 1330 Seiten
...county where the two are separated by a dark layer, or old soil, about 2 feet thick, showing that here a considerable length of time elapsed between the periods of deposition of the two. The terraces along Rock River, composed of a thick bed of waterworn gravel overlain by about 2... | |
 | 1904 - 1328 Seiten
...county where the two are separated by a dark layer, or old soil, about 2 feet thick, showing that here a considerable length of time elapsed between the periods of deposition of the two. The terraces along Rock River, composed of a thick bed of waterworn gravel overlain by about 2... | |
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