Gesamtstaat, Dualismus und Pragmatische Sanktion

The Elements of economic geology

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Monograph

Identifikator:: 1031909583

URN:: urn:nbn:de:zbw-retromon-67385

Document type:: Monograph

Author:: Zehntbauer, Richard http://d-nb.info/gnd/1055162402

Title:: Gesamtstaat, Dualismus und Pragmatische Sanktion

Edition:: Erweiterter Sonderabdruck

Place of publication:: Freiburg (Schweiz)

Publisher:: Universitäts-Buchhandlung (Otto Gschwend)

Year of publication:: 1914

Scope:: 1 Online-Ressource (73 Seiten)

Digitisation:: 2018

Collection:: Economics Books

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56 ECONOMIC GEOLOGY Ballarat plateau to determine the position and depth of its main lead, of whose meandering course there was no indi- cation on the surface, These bores initiated deep-lead mining, which depends largely on geology both for the tracing and working of the leads. Western Victoria includes a great plateau across which in Middle Kainozoic times rivers flowed southward to the Southern Ocean, and northward to the Murray River. Numerous volcanoes discharged sheets of basalt, which filled the valleys on the plateau. Subsequent denudation has removed the softer rocks which formed the banks of these 8 D F16. 18.—A SECTION ACROSS A DEEP LEap. BB, basalt plateau overlying a former river bed reached by No. 2 of the three bores, 1, 2,3. The country at the right end of the section is granodiorite sending up tongues which are associated with auriferous quartz-lodes in the slates and quartzites of the country, AB, the former outline of the valley, on the floor of which the basalt lava flow was discharged. CD, the present surface with river valleys formed on either side of the basalt plateau. valleys, and the lava flows have been left upstanding as plateaus (Fig. 18). The ancient river beds lie under the basalt and as they flowed over rocks containing many gold- quartz lodes, the river gravels contain alluvial gold. The profitable mining of these gravels required accurate know- ledge of their position and depth. The Geological Survey of Victoria therefore made lines of bores across the basalt plateaus to determine the course of the ancient river system, the tracing of which was an interesting problem in physical geology and yielded many surprises. The bore records are used to construct a section showing the varying level of the bedrock, and the height and position of the river bed. Its

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