Givetian (Middle Devonian) brachiopod–goniatite–correlation in the Dra Valley (Anti-Atlas, Morocco) and Bergisch Gladbach–Paffrath Syncline (Rhenish Massif, Germany)
Published:January 01, 2007
V. Ebbighausen, R. T. Becker, J. Bockwinkel, Z. S. Aboussalam, 2007. "Givetian (Middle Devonian) brachiopod–goniatite–correlation in the Dra Valley (Anti-Atlas, Morocco) and Bergisch Gladbach–Paffrath Syncline (Rhenish Massif, Germany)", Devonian Events and Correlations, R. T. Becker, W. T. Kirchgasser
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The Givetian pelagic and dysoxic outer shelf facies of the Dra Valley (SW Morocco) yielded as minor benthic faunal elements a number of stringocephalid and uncitid brachiopods that allow a precise correlation of these marker brachiopods with the regional, detailed goniatite zonation. In a reverse situation, the predominant neritic shallow-water succession of the Bergisch Gladbach area (Rhenish Massif, Germany), which is characterized by a detailed succession of stringocephalids and Uncites, has yielded rare and new Middle Givetian goniatite species. These findings allow, with some help of conodont data, neritic–pelagic correlations within and between widely separated basins. New species are Tornoceras n. sp. from the Büchel Formation (with coloration remains), ‘Trevoneites’ paffrathensis n. sp. from the Lower Plattenkalk Formation, and Maenioceras heinorum n. sp. from the Hornstein Member. New material of stringocephalids and Uncites is described from the Dra Valley. The identical, well-defined range of Uncites (U.) gryphus gryphus in the lower to middle parts of the Middle Givetian of the Dra Valley and Rhenish Massif underscores the stratigraphical significance of this genus that was widely distributed in Europe, northern Gondwana, the Urals, and Central and Eastern Asia.
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Devonian Events and Correlations
The Devonian was a peculiar period, characterized by simplified plate tectonic configurations, climatic overheating and widely flooded continents. The bloom of fishes and ammonoids, extensive reef complexes, and the conquest of land indicate major biosphere innovations, punctuated by many global events, including two of the biggest mass extinctions. The Devonian was the first system for which subdivisions were formally defined. This was achieved by significant advances in pelagic biostratigraphy. The chronostratigraphic framework and interdisciplinary techniques allow us to correlate intervals or sudden events across facies boundaries, in order to reconstruct the sedimentary and evolutionary history of the system with highest precision.
This volume honors the lifetime stratigraphic achievements of Michael Robert House (1930-2002). Based on case studies from Europe, North Africa and North America, it shows how the combination of biostratigraphy, chemostratigraphy, magnetostratigraphy, sequence stratigraphy and event stratigraphy can contribute to a much deeper understanding of both regional and global environmental change.