Iowa Geological Survey, Volume 9

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Published for the Iowa Geological Survey, 1899 - Geology
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Page 28 - SIR — I have the honor to submit to you the following report of work done by me during the year ending December 31st. It was my good fortune to represent the Survey at the International congress which convened at St. Petersburg late in August, 1897. After traveling several thousand miles in Russia, and visiting many of the classic localities in that country, I spent some time at Freiberg, Munchenand Berlin, and returned to the United States late in February of the present year.
Page 353 - The fineness of this material, the regular stratification and absence of organic matter indicated that at the time of the imbedding of the skeleton, the locality was covered with comparatively deep, clear, and still water, "having nothing of the character of a marsh, but rather resembling the bottom of some wide lake or some large, slowly moving river.
Page 251 - Gravel and Yarmouth Soil 339 Illinoian Till 340 Sangamon Soil and Leached Horizon 349 Lake Calvin 350 Loess 357 Terrace and Alluvium 361 Deformations 362 Joints 363 Earth Temperatures 365 Minerals 365 Economic Products 367 Coal 367 Building Stone 369 Gravel and Sand 371 Clay Industries 372 Fairport Potteries 372 Brick and Tile 372 Water Supply 374 Natural Gas 377 Soils 378 Acknowledgments 380 Forest trees 380 INTRODUCTION. LOCATION AND AREA. Muscatine county has an area of 433 square miles. It forms...
Page 427 - Claire limetone the sea covered only the southwestern part of the Niagara area, that at times the waters were comparatively shallow, and that strong currents, acting sometimes in one direction and sometimes in another, swept the calcareous mud back and forth, piling it up in the eddies in lenticular heaps or building it up in obliquely bedded masses over areas of considerable extent. The oblique beds observe no regularity with respect to either the angle or direction of dip.
Page 252 - ... in his Report of a Geological Exploration of a Part of Iowa, Wisconsin and Illinois, made to the commissioner of the general land office at Washington, and published in 1840 as a part of the senate documents.
Page 213 - The wind, crossing the valley, impinging against the hill's flanks, is deflected upward, and, coming in contact with the still air above, loses velocity, and, being unable to carry its load further, deposits it over the brow of the hill. In this location its position is reasonably secure, though the entire assemblage of deposits possesses the proclivities of the sand dune and may progress bodily inland. This process of wind transport and accumulation of materials may readily be witnessed. During...
Page 252 - Wisconsin and Illinois, made to the commissioner of the general land office at Washington, and published in 1840 as a part of the senate documents. In 1849 Dr. Owen visited the city of Muscatine, and examined the rocks there and in the region of Pine creek. An account of his observations at this time is given in his Report of a Geological Survey of Wisconsin, Iowa and Minnesota, which is a report to the commissioner of the general land office at Washington, published by congress in 1852.
Page 550 - ... need not exceed 400 acres in extent. It is not therefore necessary to suppose any unusual subterranean source, either in area or kind. Nor is it necessary to suppose a distant origin. The head is not greater than could be supplied by the country adjacent on the north, which is the probable supply-ground. It is simply a flowing drift well, run rampant for want of control. It has its phenomenal feature in its magnitude, and its lesson in its expensive and destructive career through injudicious...
Page 86 - There are considerable differences in the rainfall in different part of the state, the variation in 1894 being from 15.65 inches to 27.57. In the northwest it ran from 15 to 20 inches, and in the southeast from 20 to 25, with areas running from 25 to 30.* The run-off also varies widely. There are no data relative to Iowa streams, but it is well known that the run-off is proportional to the character of the surface, the slope and the time distribution of the rainfall. It is greater in an area with...
Page 85 - ... case, except upon the hypothesis of its being thin and much eroded. Single exposures of more than thirty feet are, however, known and there is no evidence whatever that it has been eroded. No cases of super-position have been detected nor are there forest beds, buried loess sheets or other evidences of an interglacial period. Both sorts of drift have exactly the same relations to the loess, which in turn shows no evidence of being anything except a homogeneous deposit. Except that Wheatland township...

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