Contents of 51/1
Atkins, C.J. & Peel, J.S.:
New species of Yochelcionella (Mollusca; Helcionelloida) from the Lower Cambrian of North Greenland.
Skovsted, C.B.:
Mollusc fauna of the Early Cambrian Bastion Formation of North-East Greenland..
Weidner, T.R., Ahlberg, P, Axheimer, N. & Clarkson, E.N.K. :
The middle Cambrian Ptychagnostus punctuosus and Goniagnostus nathorsti zones in Västergötland, Sweden.
Saadre, T., Einasto, R., Nõlvak, J. & Stouge, S. :
Ordovician stratigraphy of the Kovel-1 well (Volkhov–Haljala) in the Volynia region, northwestern Ukraine.
Milàn, J. & Gierlinski, G. :
A probable thyreophoran (Dinosauria, Ornithischia) footprint from the Upper Triassic of southern Sweden..
Dyke, Gareth J., Waterhouse, David M. & Kristoffersen, Anette V. :
Three new fossil landbirds from the early Paleogene of Denmark..
Contents of 51/2
Rasmussen, E.S.:
Stratigraphy and depositional evolution of the uppermost Oligocene – Miocene succession in western Denmark.
Graversen, O. :
Upper Triassic – Cretaceous stratigraphy and structural inversion offshore SW Bornholm, Tornquist Zone, Denmark..
Stemmerik, L. & Piasecki, S. :
Isotopic evidence for the age of the Røde Ø Conglomerate, inner Scoresby Sund, East Greenland.
Willumsen, P.S.:
Palynology of the Lower Eocene deposits of northwest Jutland, Denmark.
Pedersen, G.K., Pedersen, S.A.S., Steffensen, J. & Pedersen, C.S. :
Clay content of a clayey diatomite, the Early Eocene Fur Formation, Denmark.
New species of Yochelcionella (Mollusca: Helcionelloida) from the Lower Cambrian of North Greenland
Atkins, C.J. & Peel, J.S. 2004–10–20: New species of Yochelcionella (Mollusca: Helcionelloida) from the Lower Cambrian of North Greenland. Bulletin of the Geological Society of Denmark, vol. 51, pp. 1–9, Copenhagen. © 2004. By Geological Society of Denmark. ISSN 0011–6297
https://doi.org/10.37570/bgsd-2004-51-01
Abstract: Two new species of the helcionelloid mollusc genus Yochelcionella Runnegar & Pojeta, 1974 are described from Lower Cambrian strata within the Brønlund Fjord Group of central North Greenland. Yochelcionella greenlandica n. sp. is also tentatively identified from continental slope deposits of the Browns Pond Formation of New York and the ‘Anse Maranda Formation’ of Québec. The internal mould of the almost orthoconic Yochelcionella gracilis n.sp. shows a pegma-like fissure between the apex and the snorkel, a feature ortherwise only reported in Y. fissurata Hinz-Schallreuter, 1997 from the Middle Cambrian of Bornholm.
Keywords: Mollusca, Helcionelloida, Yochelcionella, Cambrian, Greenland.
Addresses:
Christian J. Atkins [ christian [dot] atkins [at] geo [dot] uu [dot] se ] & John S. Peel [john [dot] peel [at] pal [dot] uu [dot] se], Department of Earth Sciences (Palaeobiology), Uppsala University, Norbyvägen 22, SE-752 36, Uppsala, Sweden. 25 September 2004.
Download PDF (2,44 Mb)
Top
Mollusc fauna of the Early Cambrian Bastion Formation of North-East Greenland
Skovsted, C.B. 2004–10–20: Mollusc fauna of the Early Cambrian Bastion Formation of North-East Greenland. Bulletin of the Geological Society of Denmark, Vol. 51, pp. 11–37. © 2004 by Geological Society of Denmark. ISSN 0011–6297.
https://doi.org/10.37570/bgsd-2004-51-02
Abstract: A diverse mollusc fauna from the Bastion Formation (Early Cambrian, middle Dyeran Stage) of North-East Greenland includes fifteen species (thirteen helcionelloids and two bivalves), adding considerable detail to the known fossil record of Early Cambrian molluscs from Laurentia. The occurrence of secondarily phosphatized shell surfaces together with phosphatic internal moulds in acid resistant residues allows new morphological details to be observed in several taxa. The fauna shows affinity to contemporaneous faunas from the Taconic allochthon of the eastern United States, but also to mollusc faunas of South Australia, China and Europe. The following new helcionelloid taxa are described: Capitoconus inclinatus n. gen. and n. sp. Capitoconus artus n. sp., Figurina groenlandica n. sp. and Latouchella ostenfeldense n. sp.
Keywords: Mollusca, Helcionelloida, Bivalvia, Biostratigraphy, Dyeran, Botoman, Early Cambrian, Greenland.
Addresses:
Christian B. Skovsted [ christian [dot] skovsted [at] geo [dot] uu [dot] se ], Program for Palaeobiology, Department of Earth Sciences, Uppsala University, Norbyvägen 22, SE-752 36 Uppsala, Sweden. 25 June 2004.
The middle Cambrian Ptychagnostus punctuosus and Goniagnostus nathorsti zones in Västergötland, Sweden
Weidner, T.R., Ahlberg, P, Axheimer, N. & Clarkson, E.N.K. 2004–10–20: The middle Cambrian Ptychagnostus punctuosus and Goniagnostus nathorsti zones in Västergötland, Sweden. Bulletin of the Geological Society of Denmark, Vol. 50, pp. 39–45, Copenhagen. © 2004 by Geological Society of Denmark. ISSN 0011-6297.
https://doi.org/10.37570/bgsd-2004-51-03
Abstract: New trilobite discoveries from eight localities in Västergötland, south-central Sweden, demonstrate that the middle Cambrian Ptychagnostus punctuosus and Goniagnostus nathorsti zones are present in most Lower Palaeozoic outcrop areas of Västergötland, though as a thin and impersistent conglomeratic limestone, up to approximately 15 cm thick. These zones have not previously been recognised in Västergötland, except for a thin bed of limestone on Hunneberg.
Keywords: Trilobites, middle Cambrian, Ptychagnostus punctuosus Zone, Goniagnostus nathorsti Zone, Västergötland, Sweden.
Addresses:
Thomas R. Weidner [ to [dot] we [at] paradis [dot] dk ], Ravnholtvej 23, Rårup, DK-7130 Juelsminde, Denmark. Per Alberg [ per [dot] ahlberg [at] geol [dot] lu [dot] se ], GeoBiosphere Science Centre, Department of Geology, Sölvegatan 12, SE-223 62 Lund, Sweden. Niklas Axheimer [ niklas [dot] axheimer [at] geol [dot] lu [dot] se ], GeoBiosphere Science Centre, Department of Geology, Sölvegatan 12, SE-223 62 Lund, Sweden. Euan N.K. Clarkson [euan [dot] clarkson [at] ed [dot] ac [dot] uk ], Grant Institute of Earth Sciences, School of Geosciences, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, UK. 18 July 2004.
Ordovician stratigraphy of the Kovel-1 well (Volkhov–Haljala) in the Volynia region, northwestern Ukraine
Saadre, T., Einasto, R., Nõlvak, J. & Stouge, S. 2004–10–20: Ordovician stratigraphy of the Kovel-1 well (Volkhov–Haljala) in the Volynia region, northwestern Ukraine. Bulletin of the Geological Society of Denmark Vol. 51, pp. 47–69. © 2004 by Geological Society of Denmark. ISSN 0011–6297.
https://doi.org/10.37570/bgsd-2004-51-04
Abstract: The Ordovician succession of the Kovel-1 well in the Volynia region, northwestern Ukraine is composed of a basal 0.6 m thick siliciclastic unit succeeded by 24.7 m Lower and lower Middle Ordovician carbonate sediments. The carbonate rocks are divided into 13 informal lithologic units. The carbonate sediments accumulated in marine shallow water open shelf and shoal or turbulent environs. Biostratigraphically, the succession is referred to seven chitinozoan zones and 12 conodont biozones. Integration, chronostratigraphic position and correlation of the proposed biozones with those from Baltoscandia are briefly discussed. Four major unconformities are recognized within the succession: 1) the Pakerort(?)–Volkhov unconformity, 2) the mid Volkhov unconformity, 3) the early Kunda unconformity and 4) the early Mid Ordovician hiatus. The latter straddles the Oeland–Viru regional Series boundary in the well. The early Mid Ordovician unconformity is prominent and the corresponding hiatus spans the Aseri and Lasnamägi regional stages (= upper Darriwilian). A complex of cyclic transgressive–regressive depositional pattern prevailed and the whole succession is referred to three major depositional cycles. The major depositional cycles are related to global eustatic sea-level cycles in general and hypothetic way to tectonic events caused by collisions of Peri-Gondwanan microcontinents with Baltica.
Keywords: Ordovician, Kovel-1 core, Ukraine, sedimentology, facies analysis, biostratigraphy, cyclostratigraphy and sea-level curve.
Addresses:
Tõnis Saadre [ t [dot] saadre [at] egk [dot] ee ], Geological Survey of Estonia, Kadaka tee 82, 12618 Tallinn, Estonia; Rein Einasto, Tallinn College of Engineering, 62 Pärnu Street, 10135 Tallinn, Estonia; Jaak Nõlvak, Institute of Geology at Technical University, 7 Estonia Avenue, 10143 Tallinn, Estonia; Svend Stouge [svends [at] savik [dot] geomus [dot] ku [dot] dk], Geological Museum, Øster Voldgade 5–7, DK-1350 Copenhagen, Denmark. 20 August 2004.
A probable thyreophoran (Dinosauria, Ornithischia) footprint from the Upper Triassic of southern Sweden
Milàn, J. & Gierlinski, G. 2004–10–22: A probable thyreophoran (Dinosauria, Ornithischia) footprint from the Upper Triassic of southern Sweden. Bulletin of the Geological Society of Denmark, Vol. 51, pp. 71–75, Copenhagen. © 2004 by the Geological Society of Denmark. ISSN 0011–6297.
https://doi.org/10.37570/bgsd-2004-51-05
Abstract: A curious blunt-toed tridactyl footprint of a relatively large trackmaker is stored in the Geological Museum in Copenhagen. The footprint was found nearly 50 years ago in the Rhaetian coal-bearing strata mined in the Gustav Adolf Mine, near Höganäs, Scania, Southern Sweden. The morphology of the specimen suggests that it was left by an early advanced thyreophoran dinosaur, in this case the earliest known.
Keywords: Footprint, Thyreophoran dinosaur, Late Triassic, Scania, Sweden.
Addresses:
Jesper Milàn [ milan [at] geol [dot] ku [dot] dk ], Geological Institute, Østervoldgade 10, 1350 Copenhagen K, Denmark. Gerard Gierlinski [ ggie [at] pgi [dot] waw [dot] pl ], Polish Geological Institute, ul. Rakowiecka 4, 00-975 Warszawa, Poland. 16 June 2004.
Three new fossil landbirds from the early Paleogene of Denmark
Dyke, Gareth J., Waterhouse, David M. & Kristoffersen, Anette V. 2004–10–22: Three new fossil landbirds from the early Paleogene of Denmark. Bulletin of the Geological Society of Denmark. Vol. 51, pp. 77–85, Copenhagen. © 2004 by Geological Society of Denmark. ISSN 0011–6297.
https://doi.org/10.37570/bgsd-2004-51-06
Abstract: Well-preserved remains of fossil modern birds are rare, especially from the earliest stages of their evolution. In this paper we describe three new fossil specimens that can be referred to two of the major clades of extant ‘landbirds’, namely Apodiformes (‘swifts’) and Coliiformes (‘mousebirds’). Because the fossils presented here are from the earliest tertiary of Denmark, they represent some of the oldest certain records for both these major clades of modern birds (Neornithes). This new material, from the Paleocene – Lower Eocene Fur Formation (Isle-of-Mors, Jutland, Denmark) is referred to the fossil apodiform genus Eocypselus Harrison, 1984 and the coliiform genus Chascacocolius Houde & Olson, 1992. Eocypselus has been referred to within the clade Hemiprocnidae (‘tree and crested swifts’) and Chascacocolius to the Sandcoleidae, a clade of stem representatives of extant Coliiformes. The description of Chascacocolius from the Danish early tertiary increases the known diversity of stem-lineage coliiforms (Sandcoleidae) known from European deposits. New fossil material of Eocypselus shows that this taxon was a perching bird as are extant hemiprocnids – the hindlimb and foot of Eocypselus is elongate and anisodactyl, with digit III the longest of the pedal digits. Swifts and mousebirds are known to have been diverse in the earliest tertiary of Europe and North America; both these neornithine clades have a much lower extant diversity in terms of known species than that evidenced by their global fossil records, a temporal effect perhaps related to global cooling throughout the latest Tertiary.
Keywords: Fossil birds, swifts, mousebirds, Denmark, Neornithes, Eocene
Addresses:
Gareth J. Dyke [ gareth [dot] dyke [at] ucd [dot] ie ], David M. Waterhouse [ david [dot] waterhouse [at] ucd [dot] ie ], Department of Zoology, University College Dublin, Belfield Dublin 4, Ireland; Anette V. Kristoffersen, Geological
Download PDF (2,31 Mb)
Top
Stratigraphy and depositional evolution of the uppermost Oligocene –Miocene succession in western Denmark
Rasmussen, E.S. 2004–12–15: Stratigraphy and depositional evolution of the uppermost Oligocene –Miocene succession in western Denmark. Bulletin of the Geological Society of Denmark, Vol. 51, pp. 89–109. © 2004 by Geological Society of Denmark. ISSN 0011–6297.
https://doi.org/10.37570/bgsd-2004-51-07
Abstract: The uppermost Oligocene – Miocene succession in Denmark is subdivided into six depositional sequences. The development of the succession was controlled both by tectonic movements and eustatic sea-level changes. Tectonic movements generated a topography, which influenced the depositional pattern especially during low sea level. This resulted in sediment by-pass on elevated areas and the confinement of fluvial systems to structural lows. Structural highs further created restricted depositional environments behind the highs during low sea level. The structural highs were also the locus for sandy spit deposits during transgression and high sea level. Initially sediment supply was from the north and north-east but shifted within the Middle Miocene to an easterly direction indicating a significant basin reorganisation at this time. Eustatic sea-level changes mainly controlledthe timing of sequence boundary development and the overall architecture of the sequences.Consequently, the most coarse-grained sediments were deposited within the forced regressive wedge systems tract, the lowstand systems tract and the early transgressive systems tract. The most distinct progradation occurred in the Aquitanian (Lower Miocene) and was associated with a cold period in central Europe.The subsequent rise of sea level until the Serravallian (Middle Miocene) resulted in an overall back-stepping stacking pattern of the sequences and in decreasing incision.
Keywords: Oligocene, Miocene, North Sea, Denmark, eustacy, climate, tectonics, sequence stratigraphy.
Addresses:
Erik Skovbjerg Rasmussen [ esr [at] geus [dot] dk ], Geological Survey of Denmark and Greenland, Øster Voldgade10, DK-1350 Copenhagen K.
Upper Triassic – Cretaceous stratigraphy and structural inversion off-shore SW Bornholm, Tornquist Zone, Denmark
Graversen, O. 2004–12–15: Upper Triassic – Cretaceous stratigraphy and structural inversion off-shore SW Bornholm, Tornquist Zone, Denmark. Bulletin of the Geological Society of Denmark, vol. 51,pp. 111–136.
https://doi.org/10.37570/bgsd-2004-51-08
Abstract: Geological interpretations by various authors of exploration reflection seismic data offshore SW Bornholm show good agreement for the Rønne Graben. However, major differences exist regarding the Mesozoic stratigraphy and structural development of the Arnager-Darlowo Block and the Risebæk Graben. Major problems relate to the distribution and structural position of the Jurassic, and interpretation of inversion structures in the Rønne and Kolobrzeg grabens along the Arnager Block. In addition to the Pernille-1 and Stina-1 wells that document the stratigraphy of the Rønne and Kolobrzeg graben sections, the bedrock geology along the south coast of Bornholm is discussed.The Jurassic is established as a major constituent of the Arnager Block above the Risebæk Graben, in contrast to previous interpretations. The revised stratigraphy and reinterpretation of the inversion zones help to establish a new interval of basin inversion during the Jurassic – Early Cretaceous priorto the Late Cretaceous inversion. Analysis of the Late Cretaceous inversion across the Rønne Graben supports the proposed revision of the stratigraphy and leads to a new model. Previous interpreta-tions invoked a major uplift of the graben along a reverse fault at the eastern border of the Rønne Graben. In the new model, Late Cretaceous inversion across the Rønne Graben is associated withtilting of the graben during differential subsidence/uplift of the Skurup Platform and the Arnager Block, whereas reverse faulting was limited.
Keywords: Inversion, Tornquist Zone, Rønne Graben, Arnager Block, Bornholm.
Addresses:
Ole Graversen [oleg [at] geol [dot] ku [dot] dk], Geological Institute, University of Copenhagen, Geocenter København, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark.
Isotopic evidence for the age of the Røde Ø Conglomerate, inner Scoresby Sund, East Greenland
Stemmerik, L. & Piasecki, S. 2004–12–15: Isotopic evidence for the age of the Røde Ø Conglomerate, inner Scoresby Sund, East Greenland. Bulletin of the Geological Society of Denmark, vol. 51, pp. 137–140. © 2004 by Geological Society of Denmark. ISSN–6297.
https://doi.org/10.37570/bgsd-2004-51-09
Abstract: On the basis of sulphur and strontium isotope data of sedimentary gypsum it is suggested that the Røde Ø Conglomerate at C. Hofmann Halvø, East Greenland was deposited during the mid to late Permian. The δ34S values of +11.4\\\\\\‰ and +11.9\\\\\\‰ are comparable to late Permian seawater values whereas 87Sr/86Sr ratios of 0.7188137 and 0.7191609 indicate the influence of freshwater. This proposed mid to late Permian age for the Røde Ø Conglomerate makes it an equivalent to the Huledal Formation in the Jameson Land – East Greenland basins to the north-east.
Keywords: Permian, Røde Ø Conglomerate, gypsum, isotopes.
Addresses:
Lars Stemmerik [ ls [at] geus [dot] dk ] & Stefan Piasecki [ sp [at] geus [dot] dk ], Geological Survey of Denmark and Green-land, Øster Voldgade 10, DK–1350 Copenhagen K, Denmark.
Palynology of the Lower Eocene deposits of northwest Jutland, Denmark
Willumsen, P.S. 2004–12–15: Palynology of the Lower Eocene deposits of northwest Jutland, Denmark. Bulletin of the Geological Society of Denmark. Vol. 52, pp. 141–157, Copenhagen. © 2004 by Geological Society of Denmark. ISSN–6297.
https://doi.org/10.37570/bgsd-2004-51-10
Abstract: Early Eocene spores and pollen assemblages from the uppermost part of the Stolle Klint Clay and the overlying Fur Formation are diverse and well preserved. The terrestrial microflora comprises 42 species of spores and 108 species of pollen and four spores and pollen zones are established i.e. Interpollis velum-Labrapollis globosus, Basopollis atumenscens, Basopollis orthobasalis and Thomsonipollis magnificus zones. The zones are directly correlated to the existing tephra-chronology and stratigraphy. The dinoflagellate cysts assemblages are referred to Zones 6 and 7 of Heilmann-Clausen or the upper part of the Apectodinium hyperacanthum and Glaphyrocysta ordinata Interval Biozone of Powell. A marked shift in the terrestrial and marine palynomorph assemblages takes place at the transitionbetween the two oldest spore and pollen zones at c. 1.2 m below ash layer –19b.
Keywords: Palynology, early Eocene, spores and pollen, Stolle Klint Clay, Fur Formation, tephra-chronology, biostratigraphy, correlation.
Addresses:
Pi Suhr Willumsen [ pi [dot] wilumsen [at] geo [dot] uio [dot] no ], Department of Geosciences, University of Oslo, P.O. Box1047, Blindern, NO-0316 Oslo, Norway.
Clay content of a clayeydiatomite, the Early Eocene Fur Formation, Denmark
Pedersen, G.K., Pedersen, S.A.S., Steffensen, J. & Pedersen, C.S. 2004–12–15. Clay content of a clayeydiatomite, the Early Eocene Fur Formation, Denmark. Bulletin of the Geological Society of Denmark,Vol. 51, pp. 159–177. © 2004 by Geological Society of Denmark. ISSN 0011–6297.
https://doi.org/10.37570/bgsd-2004-51-11
Abstract: The Early Eocene Fur Formation is a clayey diatomite interbedded with layers of volcanic ash. The diatomite is non-calcareous, laminated or structureless, and thin sections show that the proportion of clay-sized particles to diatom frustules varies between laminae. The clay mineral phase has been isolated and its chemical composition has been determined by X-ray fluorescence (XRF). Clay mineralogical analyses based on X-ray diffraction (XRD) show that the dominant phase is smectite. A general formula for the clay mineral phase is: X0.1K0.2(Mg0.3Fe(III)0.3–0.7Al1.1–1.4)Si4O10(OH)2.The investigation indicates that the clayey diatomite of the Fur Formation comprises three components: diatom frustules, clay minerals and volcanic dust. The chemical compositions of bulk samples have been determined. The clay mineral content is calculated to be 30–45% (by weight). Volcanic dust constitutes c. 10% of the diatomite, and the rest is diatoms (opal-A). The diatom frustules contain some Al2O3 that is either of primary or diagenetic origin.
Keywords: Diatomite, clay minerals, chemical composition, Fur Formation, Early Eocene, Denmark.
Addresses:
Gunver Krarup Pedersen [ gunver [at] geol [dot] ku [dot] dk ], Geological Institute, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark.
Stig A. Schack Pedersen [ sasp [at] geus [dot] dk ], Geological Sur-vey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark.
Jacob Steffensen[ jas [at] falk [dot] geo [dot] dk ] Geological Institute, University of Copenhagen, present address: Falkenberg A/S Miljørådgivning, Vassingerødvej 145, DK-3540 Lynge .
Christian Schack Pedersen [ csp [at] kiku [dot] dk ] Institute of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark.