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Calcareous nannofossil and ammonite integrated biostratigraphy across the Jurassic – Cretaceous boundary strata of the Kopanitsa composite section (West Srednogorie Unit, southwest...

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Zeitschriftentitel: Geologica Carpathica
Personen und Körperschaften: Stoykova, Kristalina, Idakieva, Vyara, Ivanov, Marin, Reháková, Daniela
In: Geologica Carpathica, 69, 2018, 2, S. 199-219
Format: E-Article
Sprache: Unbestimmt
veröffentlicht:
Central Library of the Slovak Academy of Sciences
Schlagwörter:
Geology
author_facet Stoykova, Kristalina
Idakieva, Vyara
Ivanov, Marin
Reháková, Daniela
Stoykova, Kristalina
Idakieva, Vyara
Ivanov, Marin
Reháková, Daniela
author Stoykova, Kristalina
Idakieva, Vyara
Ivanov, Marin
Reháková, Daniela
spellingShingle Stoykova, Kristalina
Idakieva, Vyara
Ivanov, Marin
Reháková, Daniela
Geologica Carpathica
Calcareous nannofossil and ammonite integrated biostratigraphy across the Jurassic – Cretaceous boundary strata of the Kopanitsa composite section (West Srednogorie Unit, southwest Bulgaria)
Geology
author_sort stoykova, kristalina
spelling Stoykova, Kristalina Idakieva, Vyara Ivanov, Marin Reháková, Daniela 1336-8052 Central Library of the Slovak Academy of Sciences Geology http://dx.doi.org/10.1515/geoca-2018-0012 <jats:title>Abstract</jats:title><jats:p>Calcareous nannofossil, calpionellid and ammonite occurrences have been directly constrained across the Jurassic–Cretaceous boundary interval in the section of Kopanitsa, SW Bulgaria. This section reveals a continuous and expanded sedimentary record through the Upper Tithonian and Lower Berriasian, besides an excellent calcareous nannofossil and ammonite record. The topmost part of the NJT 16b and the base of NJT 17a nannofossil Subzones correspond to the ammonite Microcanthum / Transitorius Subzone. The major part of the NJT 17a Subzone equates to the Durangites spp. ammonite Zone, whereas the NJT 17b Subzone correlates to the lower part of the B. jacobi ammonite Zone. The NKT nannofossil Zone approximately corresponds to the upper part of the B. jacobi Zone and the NK-1 nannofossil Zone correlates at least to the lowest part of the T. occitanica Zone. The FOs of<jats:italic>Nannoconus globulus minor, N. wintereri, N. kamptneri minor, N. steinmannii minor, N. kamptneri kamptneri</jats:italic>and<jats:italic>N. steinmannii steinmannii</jats:italic>are confirmed as reliable bio-horizons for correlations in the Mediterranean Tethys area. The first occurrence of<jats:italic>Nannoconus wintereri</jats:italic>is regarded as an almost concomitant event with the first occurrence of<jats:italic>Berriasella jacobi</jats:italic>. We suggest it could be the most useful nannofossil proxy for approximating the base of the B. jacobi Zone. Rare, but relatively well preserved calpionellids and calcareous dinoflagellates together with microfacies analysis were used additionally for stratigraphical and palaeoenvironmental interpretations. The investigated sediments are typical for the steep slope of a steepened ramp, with accumulation of hemipelagic and gravitational deposits.</jats:p> Calcareous nannofossil and ammonite integrated biostratigraphy across the Jurassic – Cretaceous boundary strata of the Kopanitsa composite section (West Srednogorie Unit, southwest Bulgaria) Geologica Carpathica
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title Calcareous nannofossil and ammonite integrated biostratigraphy across the Jurassic – Cretaceous boundary strata of the Kopanitsa composite section (West Srednogorie Unit, southwest Bulgaria)
title_unstemmed Calcareous nannofossil and ammonite integrated biostratigraphy across the Jurassic – Cretaceous boundary strata of the Kopanitsa composite section (West Srednogorie Unit, southwest Bulgaria)
title_full Calcareous nannofossil and ammonite integrated biostratigraphy across the Jurassic – Cretaceous boundary strata of the Kopanitsa composite section (West Srednogorie Unit, southwest Bulgaria)
title_fullStr Calcareous nannofossil and ammonite integrated biostratigraphy across the Jurassic – Cretaceous boundary strata of the Kopanitsa composite section (West Srednogorie Unit, southwest Bulgaria)
title_full_unstemmed Calcareous nannofossil and ammonite integrated biostratigraphy across the Jurassic – Cretaceous boundary strata of the Kopanitsa composite section (West Srednogorie Unit, southwest Bulgaria)
title_short Calcareous nannofossil and ammonite integrated biostratigraphy across the Jurassic – Cretaceous boundary strata of the Kopanitsa composite section (West Srednogorie Unit, southwest Bulgaria)
title_sort calcareous nannofossil and ammonite integrated biostratigraphy across the jurassic – cretaceous boundary strata of the kopanitsa composite section (west srednogorie unit, southwest bulgaria)
topic Geology
url http://dx.doi.org/10.1515/geoca-2018-0012
publishDate 2018
physical 199-219
description <jats:title>Abstract</jats:title><jats:p>Calcareous nannofossil, calpionellid and ammonite occurrences have been directly constrained across the Jurassic–Cretaceous boundary interval in the section of Kopanitsa, SW Bulgaria. This section reveals a continuous and expanded sedimentary record through the Upper Tithonian and Lower Berriasian, besides an excellent calcareous nannofossil and ammonite record. The topmost part of the NJT 16b and the base of NJT 17a nannofossil Subzones correspond to the ammonite Microcanthum / Transitorius Subzone. The major part of the NJT 17a Subzone equates to the Durangites spp. ammonite Zone, whereas the NJT 17b Subzone correlates to the lower part of the B. jacobi ammonite Zone. The NKT nannofossil Zone approximately corresponds to the upper part of the B. jacobi Zone and the NK-1 nannofossil Zone correlates at least to the lowest part of the T. occitanica Zone. The FOs of<jats:italic>Nannoconus globulus minor, N. wintereri, N. kamptneri minor, N. steinmannii minor, N. kamptneri kamptneri</jats:italic>and<jats:italic>N. steinmannii steinmannii</jats:italic>are confirmed as reliable bio-horizons for correlations in the Mediterranean Tethys area. The first occurrence of<jats:italic>Nannoconus wintereri</jats:italic>is regarded as an almost concomitant event with the first occurrence of<jats:italic>Berriasella jacobi</jats:italic>. We suggest it could be the most useful nannofossil proxy for approximating the base of the B. jacobi Zone. Rare, but relatively well preserved calpionellids and calcareous dinoflagellates together with microfacies analysis were used additionally for stratigraphical and palaeoenvironmental interpretations. The investigated sediments are typical for the steep slope of a steepened ramp, with accumulation of hemipelagic and gravitational deposits.</jats:p>
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author Stoykova, Kristalina, Idakieva, Vyara, Ivanov, Marin, Reháková, Daniela
author_facet Stoykova, Kristalina, Idakieva, Vyara, Ivanov, Marin, Reháková, Daniela, Stoykova, Kristalina, Idakieva, Vyara, Ivanov, Marin, Reháková, Daniela
author_sort stoykova, kristalina
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container_title Geologica Carpathica
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description <jats:title>Abstract</jats:title><jats:p>Calcareous nannofossil, calpionellid and ammonite occurrences have been directly constrained across the Jurassic–Cretaceous boundary interval in the section of Kopanitsa, SW Bulgaria. This section reveals a continuous and expanded sedimentary record through the Upper Tithonian and Lower Berriasian, besides an excellent calcareous nannofossil and ammonite record. The topmost part of the NJT 16b and the base of NJT 17a nannofossil Subzones correspond to the ammonite Microcanthum / Transitorius Subzone. The major part of the NJT 17a Subzone equates to the Durangites spp. ammonite Zone, whereas the NJT 17b Subzone correlates to the lower part of the B. jacobi ammonite Zone. The NKT nannofossil Zone approximately corresponds to the upper part of the B. jacobi Zone and the NK-1 nannofossil Zone correlates at least to the lowest part of the T. occitanica Zone. The FOs of<jats:italic>Nannoconus globulus minor, N. wintereri, N. kamptneri minor, N. steinmannii minor, N. kamptneri kamptneri</jats:italic>and<jats:italic>N. steinmannii steinmannii</jats:italic>are confirmed as reliable bio-horizons for correlations in the Mediterranean Tethys area. The first occurrence of<jats:italic>Nannoconus wintereri</jats:italic>is regarded as an almost concomitant event with the first occurrence of<jats:italic>Berriasella jacobi</jats:italic>. We suggest it could be the most useful nannofossil proxy for approximating the base of the B. jacobi Zone. Rare, but relatively well preserved calpionellids and calcareous dinoflagellates together with microfacies analysis were used additionally for stratigraphical and palaeoenvironmental interpretations. The investigated sediments are typical for the steep slope of a steepened ramp, with accumulation of hemipelagic and gravitational deposits.</jats:p>
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spelling Stoykova, Kristalina Idakieva, Vyara Ivanov, Marin Reháková, Daniela 1336-8052 Central Library of the Slovak Academy of Sciences Geology http://dx.doi.org/10.1515/geoca-2018-0012 <jats:title>Abstract</jats:title><jats:p>Calcareous nannofossil, calpionellid and ammonite occurrences have been directly constrained across the Jurassic–Cretaceous boundary interval in the section of Kopanitsa, SW Bulgaria. This section reveals a continuous and expanded sedimentary record through the Upper Tithonian and Lower Berriasian, besides an excellent calcareous nannofossil and ammonite record. The topmost part of the NJT 16b and the base of NJT 17a nannofossil Subzones correspond to the ammonite Microcanthum / Transitorius Subzone. The major part of the NJT 17a Subzone equates to the Durangites spp. ammonite Zone, whereas the NJT 17b Subzone correlates to the lower part of the B. jacobi ammonite Zone. The NKT nannofossil Zone approximately corresponds to the upper part of the B. jacobi Zone and the NK-1 nannofossil Zone correlates at least to the lowest part of the T. occitanica Zone. The FOs of<jats:italic>Nannoconus globulus minor, N. wintereri, N. kamptneri minor, N. steinmannii minor, N. kamptneri kamptneri</jats:italic>and<jats:italic>N. steinmannii steinmannii</jats:italic>are confirmed as reliable bio-horizons for correlations in the Mediterranean Tethys area. The first occurrence of<jats:italic>Nannoconus wintereri</jats:italic>is regarded as an almost concomitant event with the first occurrence of<jats:italic>Berriasella jacobi</jats:italic>. We suggest it could be the most useful nannofossil proxy for approximating the base of the B. jacobi Zone. Rare, but relatively well preserved calpionellids and calcareous dinoflagellates together with microfacies analysis were used additionally for stratigraphical and palaeoenvironmental interpretations. The investigated sediments are typical for the steep slope of a steepened ramp, with accumulation of hemipelagic and gravitational deposits.</jats:p> Calcareous nannofossil and ammonite integrated biostratigraphy across the Jurassic – Cretaceous boundary strata of the Kopanitsa composite section (West Srednogorie Unit, southwest Bulgaria) Geologica Carpathica
spellingShingle Stoykova, Kristalina, Idakieva, Vyara, Ivanov, Marin, Reháková, Daniela, Geologica Carpathica, Calcareous nannofossil and ammonite integrated biostratigraphy across the Jurassic – Cretaceous boundary strata of the Kopanitsa composite section (West Srednogorie Unit, southwest Bulgaria), Geology
title Calcareous nannofossil and ammonite integrated biostratigraphy across the Jurassic – Cretaceous boundary strata of the Kopanitsa composite section (West Srednogorie Unit, southwest Bulgaria)
title_full Calcareous nannofossil and ammonite integrated biostratigraphy across the Jurassic – Cretaceous boundary strata of the Kopanitsa composite section (West Srednogorie Unit, southwest Bulgaria)
title_fullStr Calcareous nannofossil and ammonite integrated biostratigraphy across the Jurassic – Cretaceous boundary strata of the Kopanitsa composite section (West Srednogorie Unit, southwest Bulgaria)
title_full_unstemmed Calcareous nannofossil and ammonite integrated biostratigraphy across the Jurassic – Cretaceous boundary strata of the Kopanitsa composite section (West Srednogorie Unit, southwest Bulgaria)
title_short Calcareous nannofossil and ammonite integrated biostratigraphy across the Jurassic – Cretaceous boundary strata of the Kopanitsa composite section (West Srednogorie Unit, southwest Bulgaria)
title_sort calcareous nannofossil and ammonite integrated biostratigraphy across the jurassic – cretaceous boundary strata of the kopanitsa composite section (west srednogorie unit, southwest bulgaria)
title_unstemmed Calcareous nannofossil and ammonite integrated biostratigraphy across the Jurassic – Cretaceous boundary strata of the Kopanitsa composite section (West Srednogorie Unit, southwest Bulgaria)
topic Geology
url http://dx.doi.org/10.1515/geoca-2018-0012