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- Fascicule 2 - Devonian-Carboniferous boundary
- Shallow marine bivalves at the Devonian/Carboniferous boundary from the Velbert Anticline (Rheinisches Schiefergebirge)
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Shallow marine bivalves at the Devonian/Carboniferous boundary from the Velbert Anticline (Rheinisches Schiefergebirge)
Abstract
The bivalve fauna of the uppermost part of the Devonian (Strunian, "Etroeungt") succession in a section near Velbert (Velbert Anticline) is contained in a sandstone/siltstone complex and is dominated by members of several groups of pteriomorphs (Parallelodon, Leptodesma, Actinodesma, Pterinopecten, Newellipecten, Vertumnia, Aviculopecten, Fasciculiconcha, Acanthopecten, Streblopteria, Euchondria, Pernopecten). Infaunal bivalves such as palaeotaxodonts (Palaeoneilo, "Ctenodonta"), heteroconchs (Paracyclas) and anomalodesmatans (Edmondia) are minor components of the faunas. Comparison with older, younger and contemporary faunas from Central and Western Europe stress the transitional character of the Velbert fauna : there seems to be a gradual change from the Devonian to the Carboniferous rather than a sharp faunal break across the Devonian-Carboniferous boundary.
Zusammenfassung
Die Schichtenfolge des höchsten Famenniums (Strunium, "Etroeungt") im Raum Velbert (Velberter Sattel, Bergisches Land) besteht aus einem Schichtenkomplex von glimmerreichen Sand- und Siltsteinen, die eine artenreiche Bivalvenfauna enthalten. Es dominieren Vertreter der Pteriomorphia (Parallelodon, Leptodesma, Actinodesma, Pterinopecten, Newellipecten, Vertumnia, Aviculopecten, Fasciculiconcha, Acanthopecten, Streblopteria, Euchondria, Pernopecten). Seltener sind endobenthonische Taxa der Palaeotaxodonta (Palaeoneilo, "Ctenodonta"), Heteroconchia (Paracyclas) und Anomalodesmata (Edmondia). Vergleiche mit gleichaltrigen, älteren und jüngeren Faunen Mittel- und Westeuropas bestätigen den Übergangscharakter der Bivalvenfauna an der Devon/Karbon-Grenze ohne deutlichen Faunenschnitt.