Contents
Clemmensen, L. B., Bromley, R. G. & Holm, P. M. 2011-25-02.
Glauconitic deposits at Julegård on the south coast of Bornholm, Denmark dated to the Cambrian
Karup-Møller, S. & Makovicky, E. 2011-03-11.
On the osteology and phylogenetic affinities of Morsoravis sedilis (Aves) from the early Eocene Fur Formation of Denmark
Clemmensen, L.B., Bendixen, M., Nielsen, L., Jensen, S. & Schrøder, L. 2011-09-16.
Coastal evolution of a cuspate foreland (Flakket, Anholt, Denmark) between 2006 and 2010.
Sakala, J. & Gryc, V. 2011-09-02.
A new species of Rhysocaryoxylon (Juglandaceae) from the Lower Eocene Fur Formation of Mors island (northwest Jutland, Denmark) .
Milàn, J. 2011-09-30.
New theropod, thyreophoran, and small sauropod tracks from the Middle Jurassic Bagå Formation, Bornholm, Denmark.
Milàn, J., Lindow, B.E.K. & Lauridsen, B.W. 2011-09-30.
Bite traces in a turtle carapace fragment from the middle Danian (Lower Paleocene) bryozoan limestone, Faxe, Denmark.
Sørensen, H., Bailey, J.C. & Rose-Hansen, J. 2011-10-28.
The emplacement and crystallization of the U–Th–REE-rich agpaitic and hyperagpaitic lujavrites at Kvanefjeld, Ilímaussaq alkaline complex, South Greenland .
Kogan, I. 2011-12-02.
Remains of Saurichthys (Pisces, Actinopterygii) from the Early Triassic Wordie Creek Formation of East Greenland.
Korte, C. & Kozur, H.W. 2011-12-19.
Bio- and chemostratigraphic assessment of carbon isotope records across the Triassic–Jurassic boundary at Csővár quarry (Hungary) and Kendlbachgraben (Austria) and implications for global correlations.
Glauconitic deposits at Julegård on the south coast of Bornholm, Denmark dated to the Cambrian
Clemmensen, L. B., Bromley, R. G. & Holm, P. M. 2011-25-02. Glauconitic deposits at Julegård on the south coast of Bornholm, Denmark dated to the Cambrian
©2011 by Bulletin of the Geological Society of Denmark, Vol. 59, pp. 1–12.
ISSN 0011–6297. (www.2dgf.dk/publikationer/bulletin).
https://doi.org/10.37570/bgsd-2011-59-01
Abstract: Bioturbated, glauconitic siltstones and sandstones are overlain by presumed Upper Triassic deposits at coastal exposures at Julegård on the south coast of Bornholm. These glauconitic deposits have not previously been dated. A 40Ar-39Ar dating of the glaucony gives an age of 493 ± 2 Ma suggesting the deposits belong to the Lower Cambrian Norretorp Member of the Læså Formation.
The shallow marine deposits are strongly bioturbated, but only a single ichnoassociation is represented. The ichnogenus is referable to either Trichophycus Miller and Dyer, 1878 or Teichichnus Seilacher, 1955. Rare examples of Rusophycus Hall, 1852, probably trilobite trace fossils, are also represented.
Keywords: Bornholm, Cambrian, 40Ar-39Ar dating, trace fossils, Tricophycus, Teichichnus, Rusophycus
Addresses:
Lars B. Clemmensen , Department of Geography and Geology, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark.
Richard G. Bromley, Geological Museum, University of Copenhagen, Øster Voldgade 5-7, DK-1350 Copenhagen K, Denmark.
Paul Martin Holm, Department of Geography and Geology, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark.
Mineral X, a new thalcusite homologue from the Ilímaussaq complex, South Greenland
Karup-Møller, S. & Makovicky, E. 2011-03-11. Mineral X, a new thalcusite homologue from the Ilímaussaq complex, South Greenland
©2011 by Bulletin of the Geological Society of Denmark, Vol. 59, pp. 13–23.
ISSN 0011–6297. (www.2dgf.dk/publikationer/bulletin).
https://doi.org/10.37570/bgsd-2011-59-02
Abstract: Mineral X is assumed to be a new member of the thalcusite homologous series with the structural formula TlCu2NS2N+1 with N=1.5. It was found in loose ussingite-analcime boulders on the Taseq slope towards the Narsaq Elv in the northern part of the Ilímaussaq complex in South Greenland in association with chalcothallite, cuprostibite, galena, sphalerite, bornite, antimonian silver and seinäjokite.
Supergene alteration has resulted in a number of secondary Cu-Sb-minerals. The primary ore minerals appear to have crystallized contemporaneously under low S-fugacities.
Keywords: Tl-minerals, thalcusite homologous series, low S-fugacities, chalcothallite, cuprostibite,ussingite veins, South Greenland, Ilímaussaq, Taseq.
Addresses:
Sven Karup-Møller , Department of Civil Engineering, Technical University of Denmark;
Emil Makovicky , Institute of Geography and Geology, University of Copenhagen, Denmark.
On the osteology and phylogenetic affinities of Morsoravis sedilis (Aves) from the early Eocene Fur Formation of Denmark
Mayr G. 2011-09-02. On the osteology and phylogenetic affinities of Morsoravis sedilis (Aves) from the early Eocene Fur Formation of Denmark
©2011 by Bulletin of the Geological Society of Denmark, Vol. 59, pp. 23–35
ISSN 0011–6297. (www.2dgf.dk/publikationer/bulletin).
https://doi.org/10.37570/bgsd-2011-59-03
Abstract: Morsoravis sedilis is a small bird from the early Eocene Fur Formation of Denmark, which in the original description was considered to be most closely related to Charadriiformes. Because Morsoravis has subsequently been likened to Pumiliornis tesselatus, an equally enigmatic bird from the middle Eocene of Messel in Germany, I perform here the first phylogenetic analysis including the two taxa.
This analysis supports a sister group relationship between Morsoravis and Pumiliornis, and the clade including the two taxa is recovered as the sister taxon of the late Eocene/early Oligocene Eocuculus.I report a possible, albeit lost, second specimen of Morsoravis, and identify derived characters in support of a sister group relationship between Morsoravis and Pumiliornis.
The analysis did not resolve the higher-level affinities of the clade including Morsoravis, Pumiliornis, and Eocuculus, and did not confirm charadriiform affinities of Morsoravis. More data on the osteology of the fossils, as well as an improved understanding of the interrelationships of extant birds, are needed for a well-established phylogenetic assignment of these fossil taxa.
Keywords: Aves, Morsoravis sedilis, Pumiliornis tessellatus, Eocuculus cherpinae
Addresses:
Gerald Mayr, Forschungsinstitut Senckenberg, Sektion Ornithologie, Senckenberganlage 25, 60325 Frankfurt am Main, Germany.
Download additional data: Supplementary data file 1 – .winc-file
TopCoastal evolution of a cuspate foreland (Flakket, Anholt, Denmark) between 2006 and 2010.
Clemmensen, L.B., Bendixen, M., Nielsen, L., Jensen, S. & Schrøder, L. 2011-09-16. Coastal evolution of a cuspate foreland (Flakket, Anholt, Denmark) between 2006 and 2010.
©2011 by Bulletin of the Geological Society of Denmark, Vol. 59, pp. 37-44.
ISSN 0011–6297. (www.2dgf.dk/publikationer/bulletin).
https://doi.org/10.37570/bgsd-2011-59-04
Abstract: Flakket is a cuspate marine foreland on the north coast of Anholt in the Kattegat sea. It is composed of a number of gravel-rich beach ridges typically covered by aeolian sand and intervening swales and wetlands including a relatively large lagoon. The most recent evolution of the coastline of this marine foreland between May 2006 and September 2010 is documented in this paper.
Flakket is under erosion on its northwestern side, which has retreated up to 40 m during the observation period. The shoreline of the northeastern side of the beach-ridge plain moved up to 70 m in a seaward direction during the same period.
Keywords: Cuspate foreland, coastal evolution, shoreline retreat, Anholt
Addresses:
Lars B. Clemmensen, Mette Bendixen, Lars Nielsen, Sabrina Jensen, Louise Schrøder, Department of Geography and Geology, Øster Voldgade 10, 1350 Copenhagen K, Denmark.
A new species of Rhysocaryoxylon (Juglandaceae) from the Lower Eocene Fur Formation of Mors island (northwest Jutland, Denmark)
Sakala, J. & Gryc, V. 2011-09-02 A new species of Rhysocaryoxylon (Juglandaceae) from the Lower Eocene Fur Formation of Mors island (northwest Jutland, Denmark)
©2011 by Bulletin of the Geological Society of Denmark, Vol. 59, pp. 45-49.
ISSN 0011–6297. (www.2dgf.dk/publikationer/bulletin).
https://doi.org/10.37570/bgsd-2011-59-05
Abstract: A new species of the morphogenus Rhysocaryoxylon Dupéron (Rhysocaryoxylon madsenii Sakala & Gryc sp. nov.) is described from the Lower Eocene of the Fur Formation, Mors island, Denmark. This permineralized fossil angiosperm wood is semi-ring-porous with distinct growth ring boundaries, vessels solitary or in radial multiples of 2–5, perforation plates exclusively simple, and tyloses abundant. Rays are 1–5-seriate and heterocellular with a body composed of procumbent cells and 1–4 rows of upright marginal cells. Axial parenchyma is reticulate with numerous prismatic crystals both in chambered cells and idioblasts, forming long chains up to 12 cells high. Its equivocal botanical affinities within the family Juglandaceae are discussed.
Keywords: Rhysocaryoxylon, extinct Juglandaceae, fossil angiosperm wood, new species, Fur Formation, Lower Eocene, Denmark.
Addresses:
Jakub Sakala [rade [at] natur [dot] cuni [dot] cz], Charles University in Prague, Faculty of Science, Institute of Geology and Palaeontology, Albertov 6, 128 43 Praha, Czech Republic.
Vladimír Gryc, Mendel University in Brno, Faculty of Forestry and Wood Technology, Department of Wood Science, Zemědělská 3, 613 00 Brno, Czech Republic.
New theropod, thyreophoran, and small sauropod tracks from the Middle Jurassic Bagå Formation, Bornholm, Denmark
Milàn, J. 2011-09-30. New theropod, thyreophoran, and small sauropod tracks from the Middle Jurassic Bagå Formation, Bornholm, Denmark
©2011 by Bulletin of the Geological Society of Denmark, Vol. 59, pp. 51-59.
ISSN 0011–6297. (www.2dgf.dk/publikationer/bulletin).
https://doi.org/10.37570/bgsd-2011-59-06
Abstract: Three new dinosaur tracks are described from the Middle Jurassic Bagå Formation of Bornholm, Denmark. The tracks are all preserved as natural casts on the underside of fluvial sandstone blocks originating from the old Hasle Klinkefabrik’s clay pit, now called Pyritsøen.
The new tracks are from a medium-sized theropod, a thyreophoran, and a small sauropod. Together with a thyreophoran track and large sauropod tracks described in 2005, the Middle Jurassic dinosaur fauna of Bornholm now comprises theropods, two sizes of sauropods and at least one type of thyreophoran dinosaur. This is important additional data for the very scarce Middle Jurassic dinosaurian skeletal record of Europe.
Keywords: Dinosaur fauna, trace fossils, Middle Jurassic, theropod, thyreophoran, sauropod.
Addresses:
Jesper Milan , Geomuseum Faxe, Østsjællands Museum, Østervej 2, DK-4640 Faxe, Denmark. Also Department of Geography and Geology, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark.
Bite traces in a turtle carapace fragment from the middle Danian (Lower Paleocene) bryozoan limestone, Faxe, Denmark
Milàn, J., Lindow, B.E.K. & Lauridsen, B.W. 2011-09-30. Bite traces in a turtle carapace fragment from the middle Danian (Lower Paleocene) bryozoan limestone, Faxe, Denmark
©2011 by Bulletin of the Geological Society of Denmark, Vol. 59, pp. 61-67.
ISSN 0011–6297. (www.2dgf.dk/publikationer/bulletin).
https://doi.org/10.37570/bgsd-2011-59-07
Abstract: A fragment of a turtle carapace from the Middle Danian bryozoan limestone at the Faxe quarry, eastern Denmark, is identified as a partial costal plate from the carapace of a chelonioid turtle. The fragment bears traces of three separate acts of predation or scavenging.
Two circular bite traces Nihilichnus nihilicus Mikuláš et al. 2006, 4 mm in diameter, situated 2.5 cm apart, are interpreted as crocodylian. Groups of parallel scrapes, Machichnus bohemicus Mikuláš et al. 2006, 4–5 mm long and 0.5 mm wide, are interpreted as bite traces from sharks. Small circular traces, ~1 mm in diameter, found either alone or in a row of three, are either from sharks or fish.
This is the first record of turtles from the Danian bryozoan limestone exposed in Faxe quarry, and thus represents an important addition to the Danian vertebrate fauna of Denmark.
Keywords: Turtle, Paleocene, Faxe bryozoan limestone, Stevns Klint Formation, predation, scavenging.
Addresses:
Jesper Milan , Geomuseum Faxe/Østsjællands Museum, Østervej 2, DK-3640 Faxe, Denmark. Also Department of Geography and Geology, University of Copenhagen, Øster Voldgade 10, 1350 Copenhagen K, Denmark.
Bent E.K. Lindow , Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5–7, DK-1350 Copenhagen K, Denmark.
Bodil W. Lauridsen , Department of Geography and Geology, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark.
The emplacement and crystallization of the U–Th–REE-rich agpaitic and hyperagpaitic lujavrites at Kvanefjeld, Ilímaussaq alkaline complex, South Greenland
Sørensen, H., Bailey, J.C. & Rose-Hansen, J. 2011-10-28. The emplacement and crystallization of the U–Th–REE-rich agpaitic and hyperagpaitic lujavrites at Kvanefjeld, Ilímaussaq alkaline complex, South Greenland
©2011 by Bulletin of the Geological Society of Denmark, Vol. 59, pp. 69-92.
ISSN 0011–6297. (www.2dgf.dk/publikationer/bulletin).
https://doi.org/10.37570/bgsd-2011-59-08
Abstract: The U–Th–REE deposit located at the Kvanefjeld plateau in the north-west corner of the Ilímaussaq alkaline complex, South Greenland, consists of lujavrites which are melanocratic agpaitic nepheline syenites. The fine-grained lujavrites of the Kvanefjeld plateau can be divided into a northern and a southern part with an intermediate zone between them.
The northern part is situated along the north contact of the Ilímaussaq complex and continues east of the Kvanefjeld plateau as a lujavrite belt along the contact. This part has relatively ‘low’ contents of U, Th, and REE, and hyperagpaitic mineralogy is restricted to its highest-lying parts. The fine-grained lujavrites of the intermediate and southern part of the Kvanefjeld plateau occur between and below huge masses of country rocks which we show are practically in situ remnants of the roof of the lujavrite magma chamber. These lujavrites have high contents of U, Th, and REE, and hyperagpaitic varieties with naujakasite, steenstrupine and villiaumite are widespread.
We present a model for the formation of the fine-grained lujavrites of the Kvanefjeld plateau. In this model, an off-shoot from the large lujavrite magma body in the central part of the complex intruded into a fracture zone along the north contact of the Ilímaussaq complex and was forcefully emplaced from north-west to south-east. The intruding lujavrite magma was bounded to the west, north, and at its roof by strong volcanic country rocks, and to the south by the weaker, earlier rocks of the complex.
The magma stored in the fracture crystallized, squeezing volatile and residual ele-ments upwards. A subsequent violent explosion opened up fractures in the weaker southern rocks, and the residual volatile-enriched magma was squeezed into fractures in augite syenite, naujaite, and also in the overlying volcanic roof rocks. The removal of the volatile-rich lujavrite magma in the upper part of the fracture-bounded magma chamber made room for the rise of volatile-poor magma from the lower part of the magma chamber, and these lujavrites crystallized to form the northern continuous lujavrite belt.
Transfer and accumulation of volatile and residual elements in a lujavrite magma crystallizing below an impervious cover played a key role in the formation of the Kvanefjeld U–Th–REE deposit, as it also did in the crystallization of the lujavrite magma body in the central part of the Ilímaussaq complex.
Keywords: Ilímaussaq, Kvanefjeld, U–Th–REE deposit, lujavrite, agpaitic, hyperagpaitic, steenstru-pine, naujakasite, villiaumite, forceful emplacement.
Addresses:
Henning Sørensen, John C. Bailey, John Rose-Hansen , Department of Geography and Geology (IGG), University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark.
Remains of Saurichthys (Pisces, Actinopterygii) from the Early Triassic Wordie Creek Formation of East Greenland
Kogan, I. 2011-12-02. Remains of Saurichthys (Pisces, Actinopterygii) from the Early Triassic Wordie Creek Formation of East Greenland
©2011 by Bulletin of the Geological Society of Denmark, Vol. 59, pp. 93-100.
ISSN 0011–6297. (www.2dgf.dk/publikationer/bulletin).
https://doi.org/10.37570/bgsd-2011-59-09
Abstract: Previously undescribed specimens of Saurichthys from the basal part of the Early Triassic Wordie Creek Formation (Griesbachian) of East Greenland demonstrate a remarkably complete squamation
especially in the anterior trunk portion.
Scales of the mid-lateral row are high and those of the mid-dorsal and mid-ventral rows broad and conspicuous by having a pronounced longitudinal keel on their inner surface; additional dorso-lateral and ventro-lateral scale rows are present. This pattern resembles that of Saurichthys dayi from the Early Triassic of Alberta and British Columbia. Differences in fin morphology suggest, however, that the Greenland form is probably not conspecific.
A second Early Triassic species of Saurichthys occurring in East Greenland probably comes from a higher stratigraphic level (late Griesbachian to early Dienerian) with a different ichthyofaunal composition.
Keywords: Saurichthys, East Greenland, Wordie Creek Formation, stratigraphy.
Addresses:
I. Kogan, Freiberg University of Mining and Technology, Geological Institute, Bernhard-von-Cotta Str. 2, D-09599 Freiberg, Germany.
Bio- and chemostratigraphic assessment of carbon isotope records across the Triassic–Jurassic boundary at Csővár quarry (Hungary) and Kendlbachgraben (Austria) and implications for global correlations
Korte, C. & Kozur, H.W. 2011-12-19. Bio- and chemostratigraphic assessment of carbon isotope records across the Triassic–Jurassic boundary at Csővár quarry (Hungary) and Kendlbachgraben (Austria) and implications for global correlations
©2011 by Bulletin of the Geological Society of Denmark, Vol. 59, pp. 100-115.
ISSN 0011–6297. (www.2dgf.dk/publikationer/bulletin).
https://doi.org/10.37570/bgsd-2011-59-10
Abstract: Carbon isotope trends are useful for stratigraphic correlation, especially for time intervals when major perturbations of the global carbon cycle occurred. Such perturbations have been documented for the Triassic–Jurassic (T–J) boundary, and several successions from this time interval are characterized by (1) an initial negative excursion, followed by (2) a pronounced positive excursion and a subsequent (3) main negative carbon isotope excursion.
These features, however, are not present in all T–J boundary sections, or the stratigraphic position of the positive or the main negative excursion has variable locations. In the present study, we analysed carbon isotopes in bulk carbonate from the pelagic Csővár quarry section in Hungary and from the intra-platform basin to shallow subtidal marine Kendlbachgraben section in Austria. Both T–J boundary successions are biostratigraphically well controlled enabling – with particular focus on the bio- and chemostratigraphy of other T–J boundary sections – correlation of the carbon isotope trends.
This evaluation shows that the apex of the initial negative δ13C excursion occurred slightly, but distinctly, below the mass extinction event and represents an excellent stratigraphic correlation tool.
Keywords: Triassic–Jurassic boundary, chemostratigraphy, carbon isotopes, biostratigraphy, Csővár, Kendlbachgraben.
Addresses:
Christoph Korte , Department of Geography and Geology, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark.
Heinz W. Kozur , Rézsü u. 83, H-1029 Budapest, Hungary.