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alteration theory beds blue clay bluff bowlders Bull calcareous calcite calcium carbonate cent of MgC03 cephalon clastic coral creek crinoidal crystals Decorah deposits developed Devonian dolo dolomite areas dolomitic limestone dorsal furrows drainage east erosion evidence feet Field Mus fine-grained Fork formation formed fossils Galena genal angles glabella grains gravel gray gypsum interbedding Iowa Geological Survey Iowa river irregular Kansan drift Keokuk lateral layers lime limestone and dolomite lobes loess Louis limestone lower magnesia magnesia content magnesium Maquoketa MgCl3 miles mite Moines river Moines valley moraine mottled limestone North Liberty occipital oolite origin patches peneplain Plate Platteville Pleistocene portion precipitate production pygidium reefs region rock Saint Louis sand sandstone sea water segments shale shown Slocom slopes solution specimens stone stream surface temperature thickness tion topographic Tribes Hill trilobite upper wall Waukon weathering width Wisconsin writer Yellow clay
Page xv - Commissioners may, on formal notice, terminate this agreement. 9. The resulting maps shall fully recognize the co-operation of the State of Pennsylvania.
Page 390 - Railroads were unknown or so few as to be but slightly available and the river courses offered easy and certain lines of communication. The valleys furnished shelter for the homesteads and their supplies of timber yielded material for building as well as for fuel. The difficulty of winning the farm lands from the forest was supposed to be more than counterbalanced by the superiority of the valley soils over those of the prairie. These hardy pioneers had not come to realize that instead of marking...
Page 8 - Madison, Mahaska, Marion, Marshall, Mills, Mitchell, Monona, Monroe, Montgomery, Muscatine, O'brien, Osceola, Page, Palo Alto, Plymouth, Pocahontas, Polk, Pottawattamie, Poweshiek, Ringgold, Sac, Scott, Shelby, Sioux, Story, Tama...
Page 7 - Carroll, Cass, Cedar, Cerro Gordo, Cherokee, Chickasaw, Clarke, Clay, Clayton, Clinton, Crawford, Dallas, Davis, Decatur, Delaware, Des Moines, Dickinson, Dubuque, Emmet, Fayette, Floyd, Franklin, Fremont, Greene, Grundy, Guthrie, Hamilton, Hancock, Hardin, Harrison, Henry, Howard, Humboldt, Ida, Iowa, Jackson, Jasper, Jefferson, Johnson, Jones, Keokuk, Kossuth, Lee...
Page xiv - The preparation of the maps shall be under the supervision of the Director of the United States Geological Survey...
Page xvi - Marshall, Chief Geographer, and under the immediate supervision of WH Herron, Geographer of the Central Division. The...
Page xv - For office work on the map the salaries shall be divided between the two agreeing parties in such a way as to equalize all expenses, provided...
Page 367 - As a result of his critical investigations of the above theories Van Tuyl* states : — " Considering all the evidence, there seems to be no escape from the conclusion that the great majority of the stratified dolomites have had their inception iu the alteration of limestones.
Page xv - Geologist deem that the work is not being executed in a satisfactory manner, then he may, on formal notice, terminate this agreement. 9. The resulting maps shall fully recognize the cooperation of the State of Michigan.
Page xv - ... follow the topographic survey as closely as consistent with economy and in accordance with modern scientific methods. The time of beginning this work to be agreed upon between the State Survey Commission of Pennsylvania and the United States Geological Survey.