Reports, Volume 9 |
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Page vii
... Porphyries ...... Mineralogical Composition of the Porphyries . Texture of the Porphyries .... Distribution of the Porphyries .... Relation of Granite to Porphyry . The Algonkian Rocks ..... The Paleozoic Rocks .. Distribution and Area ...
... Porphyries ...... Mineralogical Composition of the Porphyries . Texture of the Porphyries .... Distribution of the Porphyries .... Relation of Granite to Porphyry . The Algonkian Rocks ..... The Paleozoic Rocks .. Distribution and Area ...
Page 6
... porphyry mountains was depressed and partially ( possibly wholly ) submerged in the Paleozoic seas , and the limestones and sandstones which now underlie the valleys were deposited over the lower portions and around the peaks and ...
... porphyry mountains was depressed and partially ( possibly wholly ) submerged in the Paleozoic seas , and the limestones and sandstones which now underlie the valleys were deposited over the lower portions and around the peaks and ...
Page 8
... porphyry , notwithstanding the fact that the ridge terminates less than a mile south of the gap , and is there surrounded by limestone strata in which the creek channel could have been cut with one - tenth of the energy expended in ...
... porphyry , notwithstanding the fact that the ridge terminates less than a mile south of the gap , and is there surrounded by limestone strata in which the creek channel could have been cut with one - tenth of the energy expended in ...
Page 14
... porphyry hills , and in other moist , though not wet , clayey soils . The growth of the " Flat woods " is almost exclusively post oak . Along the eastern limits of the sheet , on the sides of the porphyry hills , especially where there ...
... porphyry hills , and in other moist , though not wet , clayey soils . The growth of the " Flat woods " is almost exclusively post oak . Along the eastern limits of the sheet , on the sides of the porphyry hills , especially where there ...
Page 15
... porphyries . THE BASIC ERUPTIVES OR DIKE ROCKS . The rocks of this class are found principally in the southeastern part of the sheet . They usually occur in well - marked dikes cutting through . the granite and porphyries , or in ...
... porphyries . THE BASIC ERUPTIVES OR DIKE ROCKS . The rocks of this class are found principally in the southeastern part of the sheet . They usually occur in well - marked dikes cutting through . the granite and porphyries , or in ...
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Common terms and phrases
Archean Ardmore arenaceous argillaceous Bevier coal Bevier sheet blue bottom boulders calcareous Chariton river chert clay coal bed coarse color crystalline crystals dark deposits depth diabase dike dike rock Doe Run drab drift drill DRILL-HOLE East fork erosion Eureka shaft exposed exposures feet A. T. feet thick feldspar fine-grained Fire-clay fissile following section formation fragments Fredericktown Geological Survey grains granite gray grit Higginsville hole horizon inches Interval to top Iron Mountain sheet Ironton Lagonda Limestone loess Lower Coal Measures Macon City Macon City coal magnesian mass Middle Coal Measures Middle fork mile west mining Missouri river Motte Mulky numerous occur outcrops Paleozoic Pilot Knob porphyry portion quarry quartz railway sandstone sandy seam Section sheet Shale shaly Shepherd mountain slopes soil stone strata stream texture Thomas Hill tion topographic Total thickness township valley veins Warrensburg Waverly yellow
Popular passages
Page 81 - Ocean, the first thing which strikes us is, that, the north-east and south-east monsoons, which are found the one on the north and the other on...
Page 11 - Probibly three-fourths of the geological facts are recorded cartographically. In consequence, therefore, a modern geological map is a graphic summary of a vast amount of useful information. In addition to an accurate representation of the ordinary geographical features, as in the best atlases, a properly constructed geological map records much more. On it are indicated, within a few feet, the...
Page 12 - ... of economic value contained in the several beds, and the best places for obtaining all these substances. The map also forms a reliable soil index which, with some additional explanation serves also as a guide to the distribution of the forests and plants generally. But all the districts of the State cannot be treated alike in the mapping. Some places require far more work than others, either on account of the great importance of the mineral deposits or the natural difficulties caused by the ruggedness...
Page 3 - Major, and the Members of the Board of Managers of the Bureau of Geology and Mines: Gentlemen...
Page 49 - The true stratigraphic and structural relations of this formation, however, seem not to have been recognized. It appears generally to have been considered of Lower Coal Measure age, and to have been correlated with the inter-stratified sandstones of the Lower Coal Measures, referred to on other pages of this report. The peculiar conditions of occurrence of this formation have, however, received no satisfactory explanation in print, to the writer's knowledge.
Page 13 - Thus, one formation is abundantly supplied with coal, another with the ores of zinc and lead, a third with materials for the manufacture of cements, and others with still different substances of economic value. Each is found in a particular geological zone, and rarely or very sparingly elsewhere. Only within certain districts would search for a given substance be successful; outside of these areas no amount of prospecting would ever disclose the material sought.
Page 13 - ... other purposes. Upon it may be based models of the more important districts which are to be taken as characteristic of much larger areas, and which are to represent in a graphic manner the structure, arrangement and relations of deposits. Eventually a relief model of the. entire state may be constructed on a suitable scale. Besides for the purposes mentioned, it would afford one of the most instructive objects for presenting to the pupils of schools the geographical features of their state. With...
Page 14 - At the outset a clear understanding of the geological structure of the rocks containing it is of prime importance. The localities where each occurs require description ; the arrangement, relations and extent of the deposits must be defined; the origin and properties discussed; the accessibility and value determined ; the uses of the substances, the nature and status, both present and probable future, of the industries connected fully considered.
Page 14 - ... value. Each is found in a particular geological zone, and rarely or very sparingly elsewhere. Only within certain districts would search for a given substance be successful; outside of these areas no amount of prospecting would ever disclose the material sought. In obtaining information concerning each particular mineral substance, the entire subject must be carefully considered. At the outset a clear understanding of the geological structure of the rocks containing it is of prime importance....
Page 49 - The peculiar conditions of occurrence of this formation have, however, received no satisfactory explanation in print, to the writer's knowledge.! The theory here advanced concerning this deposit is that it is of fluvial or lacustrine origin, that it fills a channel which was eroded in the surrounding, regularly deposited strata, during a temporary emergence of these strata from beneath the waters of the Coal Measure swamp. The leading reasons for this conclusion are briefly the following : 1. The...