Contents of 45/1
Nielsen, L., Klinkby, L. & Balling, N.:
Seismic evidence for deep Palaeozoic sedimentary units in the Ringkøbing-Fyn High offshore Denmark
Christensen, W. K.:
Belemnitella from the lowermost Maastrichtian of Scania, southern Sweden .
Jagt, J. W. M., Andersen, S. B. & Jakobsen, S. L.:
The echinoid Gauthieria alterna from the uppermost Maastrichtian of Denmark
Bennike, O. & Jensen, J. B.:
Late- and postglacial shore level changes in the southwestern Baltic Sea
Ernstsen, V.:
Clay minerals of clayey subsoils of Weichselian Age in the Zealand-Funen area, Denmark .
6th Meeting of the Regional Committees on Northern Neogene and Paleogene Stratigraphy
Konradi, P. B. & Heilmann-Clausen, C. (convenors):
RCNPS/RCNNS 6th Joint Annual Meeting in Denmark
Hager, H., Vandenberghe, N., van den Bosch, M. et al. (8 other authors):
The geometry of the Rupelian and Chattian depositional bodies in the Lower Rhine district and its border area: implications for Oligocene lithostratigraphy
Clausen, O. R.:
Tectonic vs climatic control on the sequence development, examples from the Palaeogene succession in the eastern North Sea area
Louwye, S. & Laga, P.:
Dinoflagellate cysts of the shallow marine Neogene succession in the Kalmthout well, northern Belgium
Contents of 45/2
Erlström, I. & Guy-Ohlson, D.:
An Upper Triassic, Norian-Rhaetian. outlier in Skåne, southern Sweden
89
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https://doi.org/10.37570/bgsd-1998-45-09
Abramovitz. T. & Thybo, H.:
Pre-Zechstein structures around the MONA LISA deep seismic lines in the southern Horn Graben area
99
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https://doi.org/10.37570/bgsd-1998-45-10
Møller. L. N. N. & Friis. H.:
Petrographic evidence for hydrocarbon migration in Lower Cambrian sandstones, Bornholm, Denmark
117
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https://doi.org/10.37570/bgsd-1998-45-11
Seismic evidence for deep Palaeozoic sedimentary units in the Ringkøbing-Fyn High offshore Denmark
Nielsen, L., Klinkby, L. & Balling, N.: Seismic evidence for deep Palaeozoic sedimentary units in the Ringkøbing-Fyn High offshore Denmark. Bulletin of the Geological Society of Denmark, Vol. 45, pp. 1–10. Copenhagen, 1998–09–25.
https://doi.org/10.37570/bgsd-1998-45-01
Abstract: Interpretation of refracted and reflected arrivals in seismic data from the MONA LISA combined wide-angle and normal incidence deep seismic experiment in the south-eastern North Sea has revealed deep sediments in the basement high between the Central Graben and the Horn Graben.
Evidence for such deep sediments in the Ringkøbing-Fyn system of basement highs is most clearly found in refracted arrivals in wide-angle seismic data. P-waves refracted in the deep sedimentary units show velocities between ~4.5 km/s and ~5.1 km/s which are significantly below the observed velocities of about 6.0 km/s for crystalline basement. Outline of the shape and fine structure of sedimentary units are constrained by coincident normal incidence seismic reflection data.
A seismic velocity model and a reflectivity section for a 150 km section of the east-west trending MONA LISA line 3 are presented. The velocity model is consistent with both the wide-angle data and the normal incidence section. Pre-Zechstein sedimentary units locally up to 4 km in thickness are observed, and locally the top of the crystalline basement is found at depths of about 7 km to 10 km.
The boundary between the deepest sediments and the crystalline basement is characterized by several large block faults. On the flanks of the Horn Graben and the Central Graben a pronounced thinning of the pre-Zechstein sedimentary strata is observed indicating uplift and erosion of rift shoulders.
A correlation between free-air gravity anomalies, local basement highs and deep basins is observed, and the gravity data indicate that Pre-Zechstein sedimentary structures of similar thicknesses are present in the offshore part of the Ringkøbing-Fyn High both north and south of the analyzed seismic line.
Keywords: Deep Palaeozoic sediments, Ringkøbing-Fyn High, seismic velocity model, seismic reflections.
Addresses:
Lars Nielsen [ ln [at] geoserver1 [dot] aau [dot] dk ], Lone Klinkby and Niels Balling, Department of Earth Sciences, Geophysical Laboratory, University of Aarhus, Finlandsgade 8, DK-8200 Aarhus N, Denmark. 12 February 1998.
Belemnitella from the lowermost Maastrichtian of Scania, southern Sweden
Christensen, W. K.: Belemnitella from the lowermost Maastrichtian of Scania, southern Sweden. Bulletin of the Geological Society of Denmark, Vol. 45, pp. 11-21. Copenhagen, 1998-09-25. https://doi.org/10.37570/bgsd-1998-45-02
Abstract: Reassessment of the basal Lower Maastrichtian Belemnitella assemblage from the Kristianstad Basin in Scania, southern Sweden has shown that it comprisesB. carlsbergensis sp. nov. and B. aff. B. mucronata. These taxa co-occur with Belemnella (Belemnella) lanceolata, which accounts for about 90% of the belemnite fauna. Previous records of B. mucronata from the upper Upper Campanian and Lower Maastrichtian of Europe are shown to be misconceptions.
Keywords: Belemnites, Belemnitella calsbergensis sp. nov., Belemnitella aff. Belemnitella mucronata, Upper Cretaceous, basal Lower Maastrichtian, Scania, southern Sweden.
Addresses:
W. K. Christensen [ wkc [at] savik [dot] geomus [dot] ku [dot] dk ], Geological Museum, University of Copenhagen, Øster Voldgade 5–7, DK-1350 Copenhagen, Denmark. 26 January 1998
The echinoid Gauthieria alterna from the uppermost Maastrichtian of Denmarks
Jagt, J. W. M., Andersen, S. B. & Jakobsen, S. L.: The echinoid Gauthieria alterna from the uppermost Maastrichtian of Denmark. Bulletin of the Geological Society of Denmark, Vol. 45, pp. 23–26. Copenhagen, 1998–09–25.
https://doi.org/10.37570/bgsd-1998-45-03
Abstract: The present record from the white chalk of Holtug (Stevns Klint, Sjælland) of the small, distinctive phymosomatid echinoid Gauthieria alterna (Kutscher, 1985) constitutes a notable addition to the latest Maastrichtian echinoid faunas in Denmark.
Although both specimens available are crushed, preservation on the whole is better than the type material from the upper Lower Maastrichtian of Rügen (northeast Germany), and enables a more detailed description of the species, which was originally placed in Hemithylus Arnaud, 1896 but which is here transferred to the genusGauthieria Lambert, 1888. One of the specimens preserves a single demipyramid and epiphysis of the lantern.
Keywords: Echinoidea, Phymosomatidae, Maastrichtian, Denmark.
Addresses:
John W.M. Jagt [ mail [at] nhmmaastricht [dot] nl ], Natuurhistorisch Museum Maastricht, P.O. Box 882, NL-6200 AW Maastricht, the Netherlands; Søren Bo Andersen [ geolsba [at] aau [dot] dk ], Geological Institute, C.F. Møllers Allé 120, DK-8000 Aarhus C, Denmark; Sten Lennart Jakobsen [ SLJ [at] savik [dot] geomus [dot] ku [dot] dk ], GeologicalMuseum, Øster Voldgade 5-7, DK-1350 Copenhagen K, Denmark. 20 July 1998.
Late- and postglacial shore level changes in the southwestern Baltic Sea
Bennike, O. & Jensen, J. B.: Late- and postglacial shore level changes in the south-western Baltic Sea. Bulletin of the Geological Society of Denmark, Vol. 45, pp. 27–38. Copenhagen, 1998–09–25. https://doi.org/10.37570/bgsd-1998-45-04
Abstract: Sub-marine deposits in the region of the Arkona Basin, Mecklenburg Bay and Darss Sill have been studied using a multi-disciplinary approach that includes shallow seismic work, depositional sequence stratigraphy, radiocarbon dating and analyses of diatoms and macrofossils. Models for the relative shore level changes in the two basin areas are proposed.
Both in the Mecklenburg Bay basin and in the Arkona Basin maximum shore levels of c. 20 m below present sea level were reached in late Allerød, in late Younger Dryas and in late Preboreal. The drainage of the Baltic Ice Lake led to shore level drops, but in Mecklenburg Bay the drop only amounted to around 5 m, because the Darss threshold hindered further regression.
In the Arkona Basin, the drop after the final drainage of the Baltic Ice Lake was approximately 20 m, whereas the water level falls after the Allerød drainage of the Baltic Ice Lake and after the Ancylus Lake maximum, have not yet been determined. The Darss Sill area became a land area with local lakes after the Ancylus Lake drainage; there is no evidence of erosion or fluvial/deltaic sediments in Mecklenburg Bay that could be referred to the proposed so-called Dana River.
The evolution of the shore level after the Boreal lowstand is poorly confined by our data, but hydrographic conditions similar to the present were established at c. 7.6 cal. ka BP.
Keywords: Shore level displacement, sequence stratigraphy, radiocarbon dating, Quaternary, late-glacial, postglacial, Baltic Sea
Addresses:
Ole Bennike [ obe [at] geus [dot] dk ] & Jørn Bo Jensen [ jbj [at] geus [dot] dk ], Geological Surveyof Denmark and Greenland, Thoravej 8, DK-2400 Copenhagen NV, Denmark.18 March 1998.997.
Clay minerals of clayey subsoils of Weichselian Age in the Zealand-Funen area, Denmark
Ernstsen, V.: Clay minerals of clayey subsoils of Weichselian Age in the Zealand-Funen area, Denmark. Bulletin of the Geological Society of Denmark, Vol. 45, pp. 39–51. Copenhagen, 1998–09–25. https://doi.org/10.37570/bgsd-1998-45-05
Abstract: The distribution of clay mineral constituents of clay-size particles ( The regional distribution of each of these classes revealed a close association with the movement of the glaciers during the Weichselian glaciation. Post-depositional processes (oxidation and leaching) had formed two weathering zones; an upper brownish CaCO3-free zone down to depths of 1–3.5 m, and a lower brownish CaCO3-rich zone down to 3–6.5 m.
The composition of the clay minerals of weathered CaCO3-rich clayey subsoils studied at a regional scale suggested a total-transformation process of chlorite, illite, and illite-smectite to smectite and vermiculite. The diversity of clay minerals, typically 5, impeded a more thorough characterization of the transformation of individual clay mineral constituents.
Nevertheless, at the Havrebjerg site separate phases of the chlorite transformation were identified within a 0.6 m wide weathering sequence: lowest, a grey zone with unaltered inherited chlorite, followed by a greyish brown zone with slightly transformed chlorite, a brown zone with hydroxy-interlayered vermiculite/smectite, and a yellowish brown coloured zone with hydroxy-interlayered vermiculite/smectite and vermiculite/smectite (but no chlorite).
Also, the weathering sequence reflected changes in the cation exchange capacities of the clay fraction and ratio of structural Fe(II) in clay minerals to total Fe.
Keywords: Clay minerals, clay transformation, clayey till, meltwater-clay, sub-soil, weathered, unweathered, Weichselian
Addresses:
V. Ernstsen [ ve [at] geus [dot] dk ], Geological Survey of Denmark and Greenland, Thoravej 8, DK-2400 Copenhagen, Denmark. 25 June 1998.
RCNPS/RCNNS 6 th Joint Annual Meeting in Denmark
P.B. Konradi & C. Heilmann-Clausen (convenors)
The 6th Joint Meeting of the Regional Committee on Northern Neogene Stratigraphy and the Regional Committee on Northern Paleogene Stratigraphy was held in Denmark on 1–5 September 1997. The meeting and the subsequent excursion were organised by Peter Konradi and Claus Heilmann-Clausen. https://doi.org/10.37570/bgsd-1998-45-12
The Committees belong to the Subcommissions on Neogene Stratigraphy and Paleogene Stratigraphy, respectively, under the International Union of Geological Sciences.
The lecture and poster sessions as well as the business session took place at the Karlslunde Conference Centre, about 25 km south of Copenhagen City, on the 1–3 September. The meeting was attended by approximately 40 scientists from nine European countries, including Italy and Spain.
The lectures included the following topics: sequence stratigraphy, sequence development, depositional history, sedimentology, prediction of lithology, causes for sequence formation, ash-bearing strata, sedimentology, geometry of depositional bodies, lithostratigraphy, magneto-stratigraphy, biostratigraphy, palynology, sea-level changes, basin and coastal facies, marginal marine setting, molluscs, dinoflagellate cysts, Bolboforma, changing climates, palaeoenvironment, palaeoclimatology, and a new Cretaceous/Paleogene boundary section.
Four posters were presented during the lecture sessions, including a poster on the Gram clay pit.
Olaf Michelsen, secretary of the International Commission on Stratigraphy, presented the work and goals of the Commission.
The programme and abstracts were published in Danmarks og Grønlands Geologiske Undersøgelse, Rapport 1997/87.
The excursion on 3–5 September had 25 participants and visited various localities in Sjælland and Jylland, including sections of Maastrichtian-Danian, Selandian, Thanetian, Ypresian, Lutetian, Chattian and Miocene strata. Guides and contributors at the localities included: Henrik Friis, Claus Heilmann-Clausen, Ole Bjørslev Nielsen, Birger Schnitz, Bo Pagh Schultz, Georg Stenstrop, Finn Surlyk and Erik Thomsen.
During the business meeting Noël Vandenberghe, Katholieke Universiteit, Leuven, offered to host the next RCNNS/RCNPS biannual joint meeting in Leuven.
Three of the lectures given at the meeting are presented in this issue of the Bulletin of the Geological Society of Denmark.
Addresses:
P. F. Konradi, Geological Survey of Denmark and Greenland, Thoravej 8, DK-2400 Copenhagen. C. Heilmann-Clausen, Geological Institute, Aarhus University, DK-8000 Århus C. 10 August 1998.
The geometry of the Rupelian and Chattian depositional bodies in the Lower Rhine district and its border area: implications for Oligocene lithostratigraphy
Hager, H., Vandenberghe, N., van den Bosch, M., Abraham, M,. von der Hocht, F., Rescher, K., Laga, P., Nickel, E., Verstraelen, A., Leroi, S. & van Leeuwen, R. J. W.: The geometry of the Rupelian and Chattian depositional bodies in the Lower Rhine district and its border area: implications for Oligocene lithostratigraphy. Bulletin of the Geological Society of Denmark, Vol. 45, pp. 53–62. Copenhagen, 1998–09–25.
https://doi.org/10.37570/bgsd-1998-45-06
Abstract: Three profiles are constructed through the Oligocene succession of the borderland between Belgium, Germany and the Netherlands. The profiles illustrate the geometric relationships between Rupelian and Chattian successions and the lateral and vertical variations within the Rupelian and Chattian deposits.
The end-Rupelian profile between Central Belgium and the Achterhoek area in the Netherlands shows a rather uniform thickness distribution. This is in sharp contrast to the fault controlled sedimentation during the Chattian as represented on an end-Chattian profile between the same areas. Within the Chattian succession several lithostratigraphic units can be identified and correlated using a dense net of geophysical well logs.
Remarkably similar subdivisions are found in the different tectonic blocks, suggesting eustatic sea-level fluctuations. In the central part of the subsiding area the Chattian deposits are largely continental to deltaic. Laterally,these deposits developed into marine glauconitic sediments.
The end-Chattian profile between Bonn and Asten in the Netherlands runs approximately parallel with the subsidence axis. The cyclicity expressed by facies alternations due to a periodically shifting coastline can be correlated over the different blocks again suggesting the involvement of eustatic controls.
On this last profile, an anomalous geometry is due to SE-NW stress-induced movements along the Variscan Aachen overthrust.The three lithological profiles are meant to represent a frame for formal stratigraphic subdivisions and nomenclature.
Keywords: Rupelian, Chattian, stratigraphy, eustacy, tectonics.
Addresses:
H. Hager & K. Rescher, Geologisches Landesamt Nordrhein-Westfalen, Krefeld; N. Vandenberghe, A. Verstraelen & S. Leroi, Universiteit Leuven; M. van den Bosch, Nationaal Natuurhistorisch Museum Leiden/Winterswijk; A. Abraham & E. Nickel, Universität Bonn; F. von der Hocht, Rheinbraun AG, Köln; P. Laga, Belgische Geologische Dienst, Brussel; R.J.W. van Leeuwen, Nederlands Instituut voor Toegepaste Geowetenschappen – Rijksgeologische Dienst Delft/Haarlem. 8 April 1998.
Tectonic vs climatic control on the sequence development, examples from the Paleogene succession in the eastern North Sea area
Clausen, O. R.: Tectonic vs climatic control on the sequence development, examples from the Paleogene succession in the eastern North Sea area. Bulletin of the Geological Society of Denmark, Vol. 45, pp. 63–71. Copenhagen, 1998–09–25.
https://doi.org/10.37570/bgsd-1998-45-07
Abstract: A sequence stratigraphic subdivision of the upper Paleocene and the Oligocene is used to exemplify the influence of regional tectonism, local tectonism and climatic changes onto sedimentation in an epicontinental basin.
The analysis shows that the low sedimentation rate and the condensed character of the Paleocene sediments disable any identification of climatic changes, whereas the Oligocene sequence boundaries are controlled by glacio-eustatic sea level changes. Regional tectonism played a major role in generating areas exposed for erosion located east of the present North Sea Basin.
These exposed areas generated sand rich mass flows during the late Paleocene and generated the large amount of sediments which prograded into the Norwegian-Danish Basin during the Oligocene Local tectonics controlled generation of topographic depressions in the western part of the Norwegian-Danish Basin. The subtle depressions controlled the location of the sand rich mass flow deposits both during the late Paleocene and the latest Oligocene.
Keywords: Eastern North Sea, Paleogene, tectonism, climate, sedimentation.
Addresses:
Ole Rønø Clausen [ geolorc [at] aau [dot] dk ], Department of Earth Sciences, University of Aarhus, DK-8000 Århus C, Denmark. 8. April 1998.
Dinoflagellate cysts of the shallow marine Neogene succession in the Kalmthout well, northern Belgium
Louwye, S. & Laga, P.: Dinoflagellate cysts of the shallow marine Neogene succession in the Kalmthout well, northern Belgium. Bulletin of the Geological Society of Denmark, Vol. 45, pp. 73–86. Copenhagen, 1998–09–25. https://doi.org/10.37570/bgsd-1998-45-08
Abstract: The dinoflagellate cyst associations from the Neogene succession in the Kalmthout well allow a correlation with biozonations and key dinocyst events from the North Sea area and the eastcoast of the USA. The recovered cyst assemblages suggest that an Early Miocene (late Aquitanian – early Burdigalian) age can be attributed to the Berchem Formation, while the Diest Formation is of Late Miocene (late Tortonian – Messinian) age. The age of the Kattendijk Formation remains unclear. The Lillo Formation in the Kalmthout well is of Pliocene age and possibly not younger than early Late Pliocene.
Keywords: Dinoflagellates, Neogene, Southern North Sea, Belgium.
Addresses:
S. Louwye [ stephen [dot] louwye [at] rug [dot] ac [dot] be ], Laboratory for Palaeontology, University of Ghent, Krijgslaan 281/S8, B-9000 Ghent, Belgium. P. Laga [ pieter [dot] laga [at] pophost [dot] eunet [dot] be ], Geological Survey of Belgium, Jennerstraat 13, B-1000 Brussels, Belgium. 8 April 1998.
First international Bioerosion Workshop, Denmark, 1996
Bromley. R. G.:
Bioerosion: a collection of workshop paper
129
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https://doi.org/10.37570/bgsd-1998-45-13
Evans, S.:
Wood-boring bivalves and boring linings
130
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https://doi.org/10.37570/bgsd-1998-45-14
Nielsen, J. K.:
Commensal asssociation of Corbula gibba (Bivalvia) and a sub-conical boring
135
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https://doi.org/10.37570/bgsd-1998-45-15
Nielsen, K. S. S.:
Foraminiferivory revisited: a preliminary investigation of hole in foraminifera
139
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https://doi.org/10.37570/bgsd-1998-45-16
Glaub. I.:
Paleobathymetric reconstructions and fossil microborings
143
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https://doi.org/10.37570/bgsd-1998-45-17
Gektidis, M.:
Development of microbial euendolithic communities: The influence of light and time
147
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https://doi.org/10.37570/bgsd-1998-45-18
Peyrot- Clausade. M., Chazottes, V. & Pari, N.:
Bioerosion in the carbonate budget of two Indo-Pacific reefs: La Réunion (Indian Ocean) and Mooréa (Pacific Ocean)
151
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https://doi.org/10.37570/bgsd-1998-45-20
Silva, C. M. da, Cachao, M., Martinell, J. & Domènech. R.:
Bioerosional evidence of rocky palaeoshores in the Neogene of Portugal: environmental and stratigraphical significance
156
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https://doi.org/10.37570/bgsd-1998-45-19
Martinell, J., Domenèch. R. & Bromley. R. G.:
Mysterious boring hidden within the hinge plates of heterodont bivalves
161
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https://doi.org/10.37570/bgsd-1998-45-21
Laborel, J., Morhange, C., Collina-Girard, J. & Laborel-Deguen, F.:
Littoral bioerosion, a tool for the study of sea level variations during the Holocene
164
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https://doi.org/10.37570/bgsd-1998-45-22
Ruggiero. E. T.:
Bioerosive processes affecting a population of brachiopods (Upper Pliocene, Apulia)
169
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https://doi.org/10.37570/bgsd-1998-45-23
Bertling, M.:
Late Jurassic reef bioerosion – the dawning of a new era
173
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https://doi.org/10.37570/bgsd-1998-45-24
Mikulás, R.:
Subaerial animal and plant bioerosion in castellated sandstone rock (Pleistocene to Recent, Czech Republic)
177
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https://doi.org/10.37570/bgsd-1998-45-25
Krumm. D. K.:
Bivalve bioerosion in Oligocene corals from Puerto Rico and Jamaica
179
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Erratum
Article by W. K. Christensen in Vol. 45(I)
92
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https://doi.org/10.37570/bgsd-1998-45-26