Two new atrypid brachiopod species from the late Frasnian of Belgium
Bernard Mottequin
Abstract
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Bernard Mottequin
Abstract
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Two new species of atrypid brachiopods from the late Frasnian Lambermont and Barvaux formations of Belgium are described (south-east border of the Dinant Synclinorium and Vesdre Nappe), Iowatrypa ultima n. sp. and Spinatrypa (Spinatrypa) lambermontensis n. sp. These species rank among the last representatives of the order Atrypida in the Ardennes (Upper Palmatolepis rhenana Zone).
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Two new species of atrypid brachiopods from the late Frasnian Lambermont and Barvaux formations of Belgium are described (south-east border of the Dinant Synclinorium and Vesdre Nappe), Iowatrypa ultima n. sp. and Spinatrypa (Spinatrypa) lambermontensis n. sp. These species rank among the last representatives of the order Atrypida in the Ardennes (Upper Palmatolepis rhenana Zone).
Key concepts: Syncline, Nappe, Paleontology, Geology, Rank (graph theory), Structural basin, Combinatorics, Tectonics