Review of Devonian-Carboniferous Boundary sections in the Rhenish Slate Mountains (Germany)
Thirty Devonian-Carboniferous Boundary sections of the Rhenish Slate Mountains and adjacent subsurface areas are reviewed with respect to litho-, event, conodont, ammonoid, sequence, and chemostratigraphy. In the interval from the base of the uppermost Famennian (Wocklum Beds, Wocklumian) to the bas...
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Published in | Palaeobiodiversity and palaeoenvironments Vol. 101; no. 2; pp. 357 - 420 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Berlin/Heidelberg
Springer Berlin Heidelberg
01.06.2021
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Thirty Devonian-Carboniferous Boundary sections of the Rhenish Slate Mountains and adjacent subsurface areas are reviewed with respect to litho-, event, conodont, ammonoid, sequence, and chemostratigraphy. In the interval from the base of the uppermost Famennian (Wocklum Beds, Wocklumian) to the base of the middle Tournaisian (base Lower Alum Shale), 11 conodont and 16 ammonoid (sub)zones are distinguished. The terminology of the Hangenberg Crisis Interval is refined, with an overall regressive Crisis Prelude below the main Hangenberg Extinction, which defines the base of the transgressive Lower Crisis Interval (Hangenberg Black Shale). The glacigenic and regressive Middle Crisis Interval (Hangenberg Shale/Sandstone) is followed by the overall transgressive Upper Crisis Interval that can be subdivided into three parts (I to III) with the help of conodont stratigraphy (upper
costatus-kockeli
Interregnum = upper
ck
I,
Protognathodus kockeli
Zone, and lower part of
Siphonodella
(
Eosiphonodella
)
sulcata
s.l./
Pr. kuehni
Zone).
Protognathodus kockeli
includes currently a wide range of forms, which variabilities and precise ranges need to be established before a precise GSSP level should be selected. Returning to its original definition, the former Upper
duplicata
Zone is re-named as
Siphonodella
(
S.
)
mehli
Zone. It replaces the
S.
(
S.
)
jii
Zone, which is hampered by taxonomic complications. The
S.
(
S.
)
quadruplicata
Zone of Ji (
1985
) is hardly supported by Rhenish data. The entry of typical
S.
(
S.
)
lobata
(M1) characterises an upper subdivision (subzone) of the
S.
(
S.
)
sandbergi
Zone; the new
S.
(
S.
)
lobata
M2 enters much earlier within the
S.
(
S
.)
mehli
Zone. The ammonoid-defined base of the Wocklum-Stufe (Upper Devonian = UD VI) begins with the
Linguaclymenia similis
Zone (UD VI-A
1
). The oldest
S.
(
Eosiphonodella
) enter within the
Muessenbiaergia bisulcata
Zone (UD VI-A
2
). The traditional
Parawocklumeria paradoxa
Zone of Schindewolf (
1937
) is divided into successive
P. paprothae
(VI-C
1
),
P. paradoxa
(VI-C
2
), and
Mayneoceras nucleus
(VI-C
3
) Subzones. In the lower Tournaisian (Lower Carboniferous = LC I), the
Gattendorfia subinvoluta
Zone is subdivided into
G. subinvoluta
(LC I-A
2
) and “
Eocanites
”
nodosus
(LC I-A
3
) Subzones. The
Paprothites dorsoplanus
Zone (LC I-B) can be divided into
Pap. dorsoplanus
(LC I-B
1
) and
Paragattendorfia sphaeroides
(LC I-B
2
) Subzones. Potential subdivisions of the
Pseudarietites westfalicus
(LC I-C) and
Parag. patens
Zones (LC I-D) are less distinctive. The unfossiliferous or argillaceous upper part of the Hangenberg Limestone and the overlying Lower Alum Shale Event Interval remain regionally unzoned for ammonoids. |
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ISSN: | 1867-1594 1867-1608 |
DOI: | 10.1007/s12549-020-00469-6 |