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The AAPG/Datapages Combined Publications Database
Dallas Geological Society
Abstract
Black Shales
Influence of Volcanism on Upper Devonian Black Limestone and Shale Deposition, Czechoslovakia
Abstract
A new clymeniid fauna from black limestones was discovered, which can be compared with the “Annulata Horizon” in the Rhenish Slate Mountains. The origin of such thin interbeds of black limestones and shales in the European Upper Devonian is discussed; it is not likely that it can be attributed to eustatic fluctuations of sea level, regular effects of rotation of the earth or to extraterrestrial events. Also, these deposits cannot be regarded as deep water sediments formed after sudden subsidence of the sea-floor. Their lithology and faunal content do not yield any information on the depth of the sedimentary environment. Upper Devonian black sediments are thought to mark turning points in basin development. This significant change occurred at an early stage of volcanism related to geotectonic processes leading to the uplift of a median mass and deposition of flysch.
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