Uppermost Famennian stratigraphy and facies development of the Reigern Quarry near Hachen (northern Rhenish Massif, Germany)
As a contribution to the ongoing international revision of the Devonian/Carboniferous boundary, we present a bed-by-bed study of the Reigern Quarry in the northern Sauerland (Rhenish Massif, Germany), which is famous as an uppermost Famennian ammonoid locality. Currently exposed are ca. 2.5 m of str...
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Published in | Palaeobiodiversity and palaeoenvironments Vol. 97; no. 3; pp. 633 - 654 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Berlin/Heidelberg
Springer Berlin Heidelberg
01.09.2017
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | As a contribution to the ongoing international revision of the Devonian/Carboniferous boundary, we present a bed-by-bed study of the Reigern Quarry in the northern Sauerland (Rhenish Massif, Germany), which is famous as an uppermost Famennian ammonoid locality. Currently exposed are ca. 2.5 m of strongly cyclic Wocklum Limestone, conformably overlain, but with a long hiatus (topmost Famennian to upper Tournaisian), by laminated radiolarites and a thin metabentonite of the Lower Carboniferous Hardt Formation. The nodular limestones are pelagic mud-wackestones with some sporadic occurrences of cephalopod float-rudstones. The exposed part of the Wocklum Limestone falls in the successive
Bispathodus ultimus ultimus
and
Siphonodella
(
Eosiphonodella
)
praesulcata
(s.l.) zones. It yielded two new
Siphonodella
(
Eosiphonodella
) species left in open nomenclature,
Neopolygnathus communis
aff.
dentatus
and the possibly stratigraphically relevant
Bispathodus ultimus corradinii
ssp. nov. The upper range of
Palmatolepis gracilis semisigmoidalis
is significantly expanded. The conodont faunas mostly belong to variants of the pelagic
Palmatolepis
-
Bispathodus
biofacies; but in the lower part of the succession, there is a new
Neopolygnathus
biofacies that previously has not been recorded from deeper-water, pre-Hangenberg Crisis strata.
Neopolygnathus
is interpreted as a palaeoecological generalist that variably blossomed in outer or inner shelf facies and after other conodont groups declined. The mostly loose ammonoid faunas comprise almost 30 taxa and fall mostly in the lower Wocklumian
Kalloclymenia subarmata
and
Muessenbiaergia bisulcata
zones (Upper Devonian = UD VI-A
1
/A
2
), which agrees with previous ammonoid-conodont correlations. |
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ISSN: | 1867-1594 1867-1608 |
DOI: | 10.1007/s12549-017-0287-y |