The Elements of economic geology

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Monograph

Identifikator:: 1773832379

URN:: urn:nbn:de:zbw-retromon-172798

Document type:: Monograph

Author:: Gregory, John W. http://d-nb.info/gnd/11683014X

Title:: The Elements of economic geology

Place of publication:: London

Publisher:: Methuen

Year of publication:: 1928

Scope:: XIV, 312 S.; graph. Darst.

Digitisation:: 2021

Collection:: Economics Books

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Document type:: Monograph

Structure type:: Chapter

Title:: Part III. Earthy minerals

Collection:: Economics Books

208 ECONOMIC GEOLOGY retains the potassium, magnesium chloride, and bromine. The ratio of magnesium to sodium is raised from 1 to 4 in the Jordan to 8 to 5 in the Dead Sea. The rate of this change can be inferred from the amount and composition of the Jordan water, and the age of the Dead Sea has been thereby ~alculated as 50,000 years. Tue GerMAN Sart FIELDS—Some deposits of salt and B D ere Fig. 54.—GerMaN Savt FieLps. Diagrammatic section across the German salt fields, showing the general sequence and relations of the deposits. (Simplified from a section by Everding.) A = Werra type. B = Hanover type, C = 8S. Harz type, D = Stassfurt type. A. ii = ne Ex x Pre-Carboniferous and culm. Upper Carboniferous Rothliegende, lower Permian. Older primary rock-salt, Secondary rock-salt. : Younger primary rock-salt, Potash salts with their cover of clay. Main bed of anhydrite, Upper Zechstein, upper Permian, Bunter sandstones, lower Trias. gypsum have been formed by the simple evaporation of sea-water which has been cut off in lagoons; such are the layers of gypsum found on coral islands, and the lenticular patches of salt in the Permian red rocks of Kansas and the salt beds of Cheshire. The most important salt field is that of Central Germany, and its story, as illustrated by Fig. 54 may be summarized as follows. An ancient land, composed of

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