Revision of Silurian vertebrate biozones and their correlation with the conodont succession
The first vertebrate-based subdivisions of Silurian strata were mainly drawn on material from outcrops in Britain and drill cores from the southern Baltic. Nearly twenty years ago the first vertebrate biozonal scheme was developed on the basis of vertebrate distribution in several continuous drill c...
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| Format: | Article |
| Language: | English |
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Estonian Academy Publishers
2013-11-01
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| Series: | Estonian Journal of Earth Sciences |
| Subjects: | |
| Online Access: | http://www.kirj.ee/public/Estonian_Journal_of_Earth_Sciences/2013/issue_4/earth-2013-4-181-204.pdf |
| _version_ | 1819264489808199680 |
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| author | Tiiu Märss Peep Männik |
| author_facet | Tiiu Märss Peep Männik |
| author_sort | Tiiu Märss |
| collection | DOAJ |
| description | The first vertebrate-based subdivisions of Silurian strata were mainly drawn on material from outcrops in Britain and drill cores from the southern Baltic. Nearly twenty years ago the first vertebrate biozonal scheme was developed on the basis of vertebrate distribution in several continuous drill core sections in the northern Baltic. This paper presents a new scheme in which many new data on vertebrate distribution from the Baltica (Baltic region, NW Russia), Avalonia (southern Britain, eastern Canada), Laurentia (northern Canada, Greenland, Scotland) and Kara (Arctic Russia) palaeocontinents have been used. All the zones have been defined, and the geographical distribution and the reference stratum and locality for each zone have been given. The Llandovery part of the succession contains the Valyalepis crista, Loganellia aldridgei and L. scotica zones; the Wenlock part is represented by the Archipelepis bifurcata/Arch. turbinata, L. grossi, Overia adraini, L. einari and Paralogania martinssoni zones. The Par. martinssoni Zone continues in the Ludlow and is followed by the Phlebolepis ornata, Phl. elegans, Andreolepis hedei, Thelodus sculptilis and T. admirabilis zones. The last zone continues in the lower Přidoli and is followed by the Nostolepis gracilis, Poracanthodes punctatus and Trimerolepis timanica zones. The L. aldridgei and Arch. bifurcata zones are new, and the Arch. turbinata and O. adraini faunas have been raised from ‘faunal succession units’ to zones. The geographically widely distributed L. grossi Zone in the upper Sheinwoodian and the Par. martinssoni Zone in the upper Homerian–lowermost Gorstian allow the integration of regional successions into one Generalized Vertebrate Zonal Scheme. Possible correlations of conodont and vertebrate biozones, and gaps in sedimentation in the northern East Baltic Silurian sequence have been discussed, the most extensive hiatus being between the Paadla and Kuressaare stages. |
| first_indexed | 2024-12-23T20:30:18Z |
| format | Article |
| id | doaj.art-3d5115d830c24534943c29cc9161cf4d |
| institution | Directory Open Access Journal |
| issn | 1736-4728 1736-7557 |
| language | English |
| last_indexed | 2024-12-23T20:30:18Z |
| publishDate | 2013-11-01 |
| publisher | Estonian Academy Publishers |
| record_format | Article |
| series | Estonian Journal of Earth Sciences |
| spelling | doaj.art-3d5115d830c24534943c29cc9161cf4d2022-12-21T17:32:15ZengEstonian Academy PublishersEstonian Journal of Earth Sciences1736-47281736-75572013-11-0162418120410.3176/earth.2013.15Revision of Silurian vertebrate biozones and their correlation with the conodont successionTiiu MärssPeep MännikThe first vertebrate-based subdivisions of Silurian strata were mainly drawn on material from outcrops in Britain and drill cores from the southern Baltic. Nearly twenty years ago the first vertebrate biozonal scheme was developed on the basis of vertebrate distribution in several continuous drill core sections in the northern Baltic. This paper presents a new scheme in which many new data on vertebrate distribution from the Baltica (Baltic region, NW Russia), Avalonia (southern Britain, eastern Canada), Laurentia (northern Canada, Greenland, Scotland) and Kara (Arctic Russia) palaeocontinents have been used. All the zones have been defined, and the geographical distribution and the reference stratum and locality for each zone have been given. The Llandovery part of the succession contains the Valyalepis crista, Loganellia aldridgei and L. scotica zones; the Wenlock part is represented by the Archipelepis bifurcata/Arch. turbinata, L. grossi, Overia adraini, L. einari and Paralogania martinssoni zones. The Par. martinssoni Zone continues in the Ludlow and is followed by the Phlebolepis ornata, Phl. elegans, Andreolepis hedei, Thelodus sculptilis and T. admirabilis zones. The last zone continues in the lower Přidoli and is followed by the Nostolepis gracilis, Poracanthodes punctatus and Trimerolepis timanica zones. The L. aldridgei and Arch. bifurcata zones are new, and the Arch. turbinata and O. adraini faunas have been raised from ‘faunal succession units’ to zones. The geographically widely distributed L. grossi Zone in the upper Sheinwoodian and the Par. martinssoni Zone in the upper Homerian–lowermost Gorstian allow the integration of regional successions into one Generalized Vertebrate Zonal Scheme. Possible correlations of conodont and vertebrate biozones, and gaps in sedimentation in the northern East Baltic Silurian sequence have been discussed, the most extensive hiatus being between the Paadla and Kuressaare stages.http://www.kirj.ee/public/Estonian_Journal_of_Earth_Sciences/2013/issue_4/earth-2013-4-181-204.pdfagnathansfishesconodontsbiostratigraphySilurianBaltic regionBritish IslesCanadaRussian Arctic. |
| spellingShingle | Tiiu Märss Peep Männik Revision of Silurian vertebrate biozones and their correlation with the conodont succession Estonian Journal of Earth Sciences agnathans fishes conodonts biostratigraphy Silurian Baltic region British Isles Canada Russian Arctic. |
| title | Revision of Silurian vertebrate biozones and their correlation with the conodont succession |
| title_full | Revision of Silurian vertebrate biozones and their correlation with the conodont succession |
| title_fullStr | Revision of Silurian vertebrate biozones and their correlation with the conodont succession |
| title_full_unstemmed | Revision of Silurian vertebrate biozones and their correlation with the conodont succession |
| title_short | Revision of Silurian vertebrate biozones and their correlation with the conodont succession |
| title_sort | revision of silurian vertebrate biozones and their correlation with the conodont succession |
| topic | agnathans fishes conodonts biostratigraphy Silurian Baltic region British Isles Canada Russian Arctic. |
| url | http://www.kirj.ee/public/Estonian_Journal_of_Earth_Sciences/2013/issue_4/earth-2013-4-181-204.pdf |
| work_keys_str_mv | AT tiiumarss revisionofsilurianvertebratebiozonesandtheircorrelationwiththeconodontsuccession AT peepmannik revisionofsilurianvertebratebiozonesandtheircorrelationwiththeconodontsuccession |