Famennian Stage

Famennian Stage

 

the upper stage of the upper series of the Devonian system. The Famennian stage was identified by the Belgian geologist A. Dumont in 1855. In its type locality, the stage is represented by sandstones, shales, and limestones containing brachiopods and other organic remains; in the Rhine region of West Germany there are bathypelagic shales and limestones containing cephalopods.

The Famennian stage is divided into two or, occasionally, three substages and several biozones (as many as five). Deposits of the Famennian stage are widespread in the USSR. They are represented by limestones and sand-shale strata, as well as by variegated continental formations and lagoon formations, that is, evaporites formed by the retreat of the sea and by drainage and salination in regions of sediment accumulation.

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The Klunas fossil fish locality on the right bank of the Skujaine River corresponds to the mainly clastic deposits of the Tervete Formation (Fm; coincides approximately with the trachytera and possibly postera conodont zones of the Standard Conodont Zonation, the Famennian Stage of the Upper Devonian), and yields a rich assemblage of fossils represented by fish, charophyte algae and vascular plant remains, as well as rare trace fossils.
The extinction began an extended interval of low biodiversity known as the Famennian stage.
The Frasnian is also incomplete, being represented by the lower substage and the major part of the middle substage, whereas the upper Frasnian and the Famennian Stage are lacking in Estonia.