File:Geology and agriculture (1892) (14745295506).jpg

Identifier: geologyagricultu05loui (find matches)
Title: Geology and agriculture
Year: 1892 (1890s)
Authors: Louisiana Geological Survey Louisiana Agricultural Experiment Station
Subjects: Geology
Publisher: Baton Rouge
Contributing Library: Wellesley College Library
Digitizing Sponsor: Boston Library Consortium Member Libraries

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General Geology: Cretaceous 57 It evident that subsidences and consequent dislocations fre-quently occur in the mass; and large fragments frequentlytumble down. Hopkins section (see p. 33 of this report) shows his idea ofthe relation of the Eocene and Cretaceous. N
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I Fig. 3.—Sketch of IVinJieldmarblequarry and surroundings. Thismap embraces one square mile. Elevations are denoted by cofitourintervals of 20 feet, commencing with o at the base of the easternBluff. Johnson has indicated that the Cretaceous limestone, Tertiarylimestone (which he improperly calls Jackson) and the Orangesands above, are each unconformable in their bedding to all theother layers. Lerch (p. 72, 2d report), says definitely that at the close ofthe Me.sozoic time enormous plutonic forces convulsed, fractured, 58 Geological Survey ok Louisiana (Sect. faulted and folded the Cretaceous strata, throwing up mountainchains of vast extent, and raising them far above the waters ofthe gulf. If we could remove the covering mantle of Tertiaryand drift, we would yet see the chains and peaks of limestoneranges formed at the close of the middle age of our planet,altered somewhat by later erosion and denudation. He believesthere was no interval of a land period between the Cretaceousan

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