File:Reports (1908) (14598359177).jpg

Identifier: reports9190miss (find matches)
Title: (Reports)
Year: 1903 (1900s)
Authors: Missouri. Division of Geological Survey and Water Resources
Subjects: Geology Mines and mineral resources
Publisher: Rollo (etc.)
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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ally better than that of any of the other formations. Disin-tegration is more regular and proceeds faster. The residual ma-terial is thicker, since less of the formation is removed in solutionby the underground waters. The Lamotte sandstone results in a sandy soil, having verylittle virtue for agriculture. However, it is often mixed withthe residual clay from the higher formations, by which it is tem-pered to a degree which makes it very excellent. The igneous areas are chiefly found in the shape of steep sidedhills and ridges where there is little chance for soils to accumulate.The soils, wherever they occur are rich and productive. The topsof the granite and rhyolite ridges are narrow and the hillsides arecovered with talus. In Sees. 8, 9, 16, 17, 20, 21 and 22, T. 36 N., R. 5 E., in thesoutheastern part of the area included in the special map of theFlat River-Leadwood areas, the residual deposits are in places ofunusual thickness. Some of the drill holes in this area have passed Of
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SOILS. 13 through over 180 feet of residual clay, some of which containslarge and small boulders of flint. The cuts along the railroad leading to Federal Shaft No. 9illustrate beautifully the manner in which the Doerun dolomitedecomposes beneath a mantle of residual clay and gravel. (SeePlate III). The cuts along this line also show the character ofthe upper 30 feet of the residual material passed through in thedrill holes of this area. (See Plate III). The peculiarities of the weathered surfaces of the variousformations are discussed under the heads of the several formationsdescribed in the following chapter. CHAPTER II GENERAL GEOLOGICAL HISTORY. INTRODUCTION. The Ozark plateau, with which are inseparably associated theenormously rich deposits of lead and zinc of Missouri, Kansas.Oklahoma and Arkansas, consists chiefly of Paleozoic sediments.These were laid down during five or six periods of subsidence andsedimentation which alternated with long periods of elevation anderosion. Most

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