Eifelian Stage

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Eifelian Stage

 

the lower stage of the Middle Devonian system (period). The Eifelian was established in the Eifel Mountains (in what is now the Federal Republic of Germany) in 1848 by the Belgian geologist A. Dumont. The stratotype of the Eifelian is represented chiefly by marls. In the Ardennes of Belgium it corresponds approximately to the shales of the Couvinian stage of J. d’Omalius d’Halloi, whose base is stratigraphically lower than the base of the Eifelian.

In the USSR the Eifelian (Couvinian) is taken to be more inclusive than in the stratotype and includes the analogues of the Zlihovian stage of Czechoslovakia and the upper part of the Em-sian stage of the Rhine region. The Eifelian, which is divided into two substages, is widespread and represented by various rocks, such as marine carbonate and terrigenous rocks, evaporites, continental detrital rocks, and effusive rocks. In the USSR, complex ores, bauxites, iron, manganese, titanium, petroleum, rock salt, and other mineral products are associated with Eifelian beds.

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References in periodicals archive ?
Microbrachius sinensis is dated as Eifelian, Middle Devonian and Microbrachius chuandongensis Wang & Zhang, 1999 is dated as Emsian, Early Devonian (see the discussion for more comments on these species).
For those not interested in stratigraphic details like the basal conodont zone of the Eifelian, a useful overview for each period (plate tectonics, life, extinctions, climate, environments, stages in global history, and more) can be plucked out without too much sieving.
Accordingly, this new crinoid material should be regarded as upper Eifelian in age (Spading 1999; Baird and others 1999).
The bedrock, mostly Eifelian sand- and siltstones of the Middle Devonian Arukula Regional Stage ([D.
The Eifelian sandstone of the Middle Devonian Arukula Regional Stage, covered with a thin layer of the reddish-brown till of the last glaciation, crops out near the mouth of the river.
The Eifelian (Middle Devonian) deposits include marls and dolomites in the lower part and clays and siltstones in the upper part.
Early Eifelian vertebrates are known from the Parnu Regional Stage (RS) in the western part of the MDF (territory of Estonia and Latvia).
Middle Devonian; Eifelian and Givetian; Narva and Burtnieki RSs of Estonia and Russia and, probably, Upper Devonian; Famennian of Russia.
Carbon isotope stratigraphy of Lochkovian to Eifelian limestones from the Devonian of central and southern Europe.
Biostratigraphy of the Emsian to Eifelian in the Holy Cross Mountains (Poland).