Report on the Geological Survey of the State of Iowa, to the Thirteenth General Assembly, January, 1870: Containng Results of Examinations and Observations Made Within the Years 1866, 1867, 1868 and 1869, Band 1Mills & Company, 1870 |
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
abundant Adair county banks bed of coal beneath Big Sioux river Bluff Deposit Bluish border boulders Burlington limestone calcareous carbonaceous shale Cass county character clay clayey shale coal-measure formation compact composed contains creek Cretaceous Decatur county depth drainage drained Drift Deposit eastern exist exposed exposures of strata flood-plain forest trees fossil Fremont county genus of fossil geological Geologist Glacial epoch glaciers Grand river hundred feet impure limestone Keokuk lake layers lime Louis limestone Lower coal-measures Madison county magnesian marly material Middle coal-measures Middle river miles mill Mississippi Missouri river Moines nearly Nodaway northern northward occupied portion prairie quartzite Railroad levels reach region Ringgold county sand sandstone seen shale shaly silicious Silurian slope soil southern boundary southward stone strata streams sub-carboniferous surface deposits Taylor county township tributaries uplands usually valley valley-sides Watershed western Iowa westward whole Winterset Yellowish
Beliebte Passagen
Seite 32 - This watershed is formed by the highest land between those rivers along the whole length of a line running southward from a point on the northern boundary line of the State near Spirit lake, in Dickinson county, to a nearly central point in the northern part of Adair county.* From the last named point, this highest ridge of land, SURFACE FEATURES.
Seite 235 - Vertebrates are only known by the remains of salachians, or sharks, and ganoids. Upper Coal Measures. — The area occupied by this formation in Iowa is very great, comprising thirteen whole counties, in the southwestern part of the State. It adjoins by its northern and eastern boundaries the area occupied by the middle coal measures. The prominent lithological features of this formation are its limestones, yet it contains a considerable proportion of shales and sandstones.
Seite 64 - ... which the river flows. It is bordered by abrupt hills or bluffs. The bottom of the valley ranges from one to eight miles in width. The whole space between the bluffs is occupied by the river and its bottom, or flood plain only, if we except the occasional terraces or remains of ancient flood plains, which are not now reached by the highest floods of the river. The river itself is from half a mile to nearly a mile in width. There are but four points along the whole length of the State where the...
Seite 183 - Its eastern border passes from the northeastern part of Winnebago County, with considerable directness in a southeasterly direction to the northern part of Washington County. Here it makes a broad and direct bend nearly eastward, striking the Mississippi River at Muscatine.
Seite 121 - ... exist there, and also in part from the conglomerate and pudding-stone beds of the Sioux quartzite. In Southern Iowa, the soil is frequently stiff and clayey. This preponderating clay is doubtless derived from the clayey and shaly beds which alternate with the limestones of that region. The bluff soil is that which rests upon, and constitutes a part of, the bluff deposit. It is found only in the western part of the State, and adjacent to the Missouri River. Although it contains less than one per...
Seite 63 - ... of small farms, but usually it is too narrow for such purposes. On the higher surface, however, as soon as you leave the valley you come immediately upon a cultivated country. This stream has the greatest slope per mile of any in Iowa, consequently it furnishes immense water power. In some places, where creeks come into it, the valley widens and affords good locations for farms. The town of Decorah, in Winnesheik County, is located in one of these spots, which makes it a lovely location ; and...
Seite 103 - It is of a slightly yellowish ash color, except where rendered darker by decaying vegetation, very fine, not sandy and yet not adhesive. At the surface it makes excellent soil, and is just as fertile if obtained at a depth of two hundred feet. It is easily excavated by the spade alone, and yet it remains so unchanged by the atmosphere and frost that wells dug in it require to be walled only to a point just above the water - line, while the remainder stands so securely without support that the spade...
Seite 234 - Middle Coal Measures. — This formation within the State of Iowa occupies a narrow belt of territory in the southern central portion of the State, embracing a superficial area of about fourteen hundred square miles. The counties more or less underlaid by this formation are Guthrie...
Seite 8 - Geologist and shall hold his office for the term of two years, or until his successor is appointed.
Seite 10 - General Assembly. SEC. 3. On or before the first Monday in each year the State Geologist shall prepare careful statements of his accounts with the survey for the previous year, embodying them in the form of a financial report, and send the same to the Governor together with such vouchers as it may be practicable for him to obtain ; and the Governor shall lay the whole before the General Assembly, together with the report of progress of the State Geologist. SEC. 4. All acts and parts of acts in contravention...