The Turonian/Coniacian (T/C) boundary in the Upper Cretaceous of the Elbe Valley/Saxony (Germany)
Three lithofacies characterize the TuronianlConiacian sequences in the Upper Cretaceous of the Elbe Valley. The marly lithofacies, between Weinbohla - Dresden - Heidenau, consists of marls and calcareous clays (Strehlen Formation). A transitional lithofacies , with alternations of marls, clays and b...
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Institute of Geology University of Warsaw
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ftjgq:oai:geojournals.pgi.gov.pl:article/10211 2023-05-15T18:01:14+02:00 The Turonian/Coniacian (T/C) boundary in the Upper Cretaceous of the Elbe Valley/Saxony (Germany) Tröger, Karl-Armin Wejda, Mario 2003-12-10 application/pdf https://gq.pgi.gov.pl/agp/article/view/10211 eng eng Institute of Geology University of Warsaw https://gq.pgi.gov.pl/agp/article/view/10211/8732 Acta Geologica Polonica; Vol 48, No 4 (1998): Inoceramid record and biostratigraphy; 387-394 001-5709 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2003 ftjgq 2019-08-13T19:05:53Z Three lithofacies characterize the TuronianlConiacian sequences in the Upper Cretaceous of the Elbe Valley. The marly lithofacies, between Weinbohla - Dresden - Heidenau, consists of marls and calcareous clays (Strehlen Formation). A transitional lithofacies , with alternations of marls, clays and blocky sandstones, follows to the southeast (area between Rosenthal - Pima - Lohmen). A sandy lithofacies, with blocky sandstones, is developed even farther to the southeast (Elbsandsteingebirge). The TIC boundary is situated in the lower part of the Strehlen Formation in the marly lithofacies, known from several boreholes. Coniacian index ammonites are absent across the TIC boundary in the three investigated boreholes apart from a deformed and incomplete specimen of Placenticeras cf. orbignyanum (GEINITZ). Therefore, bivalves must be used to place the TIC boundary. The Didymotis event II (Dresden-Marienhof Borehole), with Cremnoceramus waltersdorfensis (ANDERT), lies at the top of the Upper Turonian M. scupini Zone. The rarity or absence of the bivalve Didymotis in the Dresden-Blasewitz and Graupa boreholes is caused by facies changes. The FAD of Cremnoceramus rotundatus (TRaGER non FIEGE) , especially the C. rotundatus Event (Graupa Borehole, Hinterjessen Marl), can be used to place the TIC boundary. A small interval below the FAD of C. rotundatus and above the Didymotis II event, which may belong to the basal Coniacian, yields Cremnoceramus waltersdorfensis (ANDERT), Cremnoceramus waltersdorfensis hannovrensis (HEINZ), Mytiloides carpathicus (SIMIONESCU) and Placenticeras cf. orbignyanum (GEINITZ). In the sandy lithofacies fossils are rare. It is not possible to place the boundary in either the Herrenleite Sandstone or in sandstone d. In the marly lithofacies of the Upper Cretaceous of Saxony bracketing of the TIC boundary is possible by means of planktonic foraminifera. It is possible to identify the evolution of planoconvex double-keeled globotruncanids of the Dicarinella hagni - Dicarinella primitiva -Dicarinella concavata group from the Upper Turonian. In the Dresden-Blasewitz and Dresden-Marienhof boreholes this group is represented in the TIC boundary interval by Marginotruncana paraconcavata PORTHAULT and Dicarinella cf. concavata (BROTZEN). They are of rare occurrence because they are facies controlled. It is not possible to recognize the boundary between the schneegansi and concavata zones because of the restricted occurrence and rarity of the index forms in the investigated sections. In the Dresden-Blasewitz and Dresden-Marienhof boreholes the benthonic species Stensioeina granulata (OLBERTZ) was identified. Article in Journal/Newspaper Planktonic foraminifera Geological Quarterly Rosenthal ENVELOPE(-64.283,-64.283,-64.600,-64.600) |
institution |
Open Polar |
collection |
Geological Quarterly |
op_collection_id |
ftjgq |
language |
English |
description |
Three lithofacies characterize the TuronianlConiacian sequences in the Upper Cretaceous of the Elbe Valley. The marly lithofacies, between Weinbohla - Dresden - Heidenau, consists of marls and calcareous clays (Strehlen Formation). A transitional lithofacies , with alternations of marls, clays and blocky sandstones, follows to the southeast (area between Rosenthal - Pima - Lohmen). A sandy lithofacies, with blocky sandstones, is developed even farther to the southeast (Elbsandsteingebirge). The TIC boundary is situated in the lower part of the Strehlen Formation in the marly lithofacies, known from several boreholes. Coniacian index ammonites are absent across the TIC boundary in the three investigated boreholes apart from a deformed and incomplete specimen of Placenticeras cf. orbignyanum (GEINITZ). Therefore, bivalves must be used to place the TIC boundary. The Didymotis event II (Dresden-Marienhof Borehole), with Cremnoceramus waltersdorfensis (ANDERT), lies at the top of the Upper Turonian M. scupini Zone. The rarity or absence of the bivalve Didymotis in the Dresden-Blasewitz and Graupa boreholes is caused by facies changes. The FAD of Cremnoceramus rotundatus (TRaGER non FIEGE) , especially the C. rotundatus Event (Graupa Borehole, Hinterjessen Marl), can be used to place the TIC boundary. A small interval below the FAD of C. rotundatus and above the Didymotis II event, which may belong to the basal Coniacian, yields Cremnoceramus waltersdorfensis (ANDERT), Cremnoceramus waltersdorfensis hannovrensis (HEINZ), Mytiloides carpathicus (SIMIONESCU) and Placenticeras cf. orbignyanum (GEINITZ). In the sandy lithofacies fossils are rare. It is not possible to place the boundary in either the Herrenleite Sandstone or in sandstone d. In the marly lithofacies of the Upper Cretaceous of Saxony bracketing of the TIC boundary is possible by means of planktonic foraminifera. It is possible to identify the evolution of planoconvex double-keeled globotruncanids of the Dicarinella hagni - Dicarinella primitiva -Dicarinella concavata group from the Upper Turonian. In the Dresden-Blasewitz and Dresden-Marienhof boreholes this group is represented in the TIC boundary interval by Marginotruncana paraconcavata PORTHAULT and Dicarinella cf. concavata (BROTZEN). They are of rare occurrence because they are facies controlled. It is not possible to recognize the boundary between the schneegansi and concavata zones because of the restricted occurrence and rarity of the index forms in the investigated sections. In the Dresden-Blasewitz and Dresden-Marienhof boreholes the benthonic species Stensioeina granulata (OLBERTZ) was identified. |
format |
Article in Journal/Newspaper |
author |
Tröger, Karl-Armin Wejda, Mario |
spellingShingle |
Tröger, Karl-Armin Wejda, Mario The Turonian/Coniacian (T/C) boundary in the Upper Cretaceous of the Elbe Valley/Saxony (Germany) |
author_facet |
Tröger, Karl-Armin Wejda, Mario |
author_sort |
Tröger, Karl-Armin |
title |
The Turonian/Coniacian (T/C) boundary in the Upper Cretaceous of the Elbe Valley/Saxony (Germany) |
title_short |
The Turonian/Coniacian (T/C) boundary in the Upper Cretaceous of the Elbe Valley/Saxony (Germany) |
title_full |
The Turonian/Coniacian (T/C) boundary in the Upper Cretaceous of the Elbe Valley/Saxony (Germany) |
title_fullStr |
The Turonian/Coniacian (T/C) boundary in the Upper Cretaceous of the Elbe Valley/Saxony (Germany) |
title_full_unstemmed |
The Turonian/Coniacian (T/C) boundary in the Upper Cretaceous of the Elbe Valley/Saxony (Germany) |
title_sort |
turonian/coniacian (t/c) boundary in the upper cretaceous of the elbe valley/saxony (germany) |
publisher |
Institute of Geology University of Warsaw |
publishDate |
2003 |
url |
https://gq.pgi.gov.pl/agp/article/view/10211 |
long_lat |
ENVELOPE(-64.283,-64.283,-64.600,-64.600) |
geographic |
Rosenthal |
geographic_facet |
Rosenthal |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Acta Geologica Polonica; Vol 48, No 4 (1998): Inoceramid record and biostratigraphy; 387-394 001-5709 |
op_relation |
https://gq.pgi.gov.pl/agp/article/view/10211/8732 |
_version_ |
1766170600615706624 |