Contents
Weidner, T. & Nielsen, A.T. 2015-02-27.
Agraulos longicephalus and Proampyx? depressus (Trilobita) from the Middle Cambrian of Bornholm, Denmark.
Hansen, J.M. 2015-03-28
Book Review: Kardel. T. & Maquet, P. (eds) 2013: Nicolaus Steno. Biography and Original Papers of a 17th. Century Scientist. Springer-Verlag, Berlin, Heidelberg, 739 pp: Finally, all Steno’s scientific papers translated from Latin into English.
Clemmensen, L.B., Glad, A.C., Hansen, K.W.T. & Murray, A.S., 2015-04-24.
Episodes of aeolian sand movement on a large spit system (Skagen Odde, Denmark) and North Atlantic storminess during the Little Ice Age.
Olivarius, M., Friis, H., Kokfelt, T.F. & Wilson, J.R. 2015-05-29.
Proterozoic basement and Palaeozoic sediments in the Ringkøbing–Fyn High characterized by zircon U–Pb ages and heavy minerals from Danish onshore wells.
Pokorný, R., Krmíček, L. & Árting, U.E. 2015-11-12.
The first evidence of trace fossils and pseudo-fossils in the continental interlava volcaniclastic sediments on the Faroe Islands.
Weidner, T., Geyer, G., Ebbestad, J. O. R. & von Seckendorff, V. 2015-12-04
Glacial erratic boulders from Jutland, Denmark, feature an uppermost lower Cambrian fauna of the Lingulid Sandstone Member of Västergötland, Sweden.
Agraulos longicephalus and Proampyx? depressus (Trilobita) from the Middle Cambrian of Bornholm, Denmark
Weidner, T. & Nielsen, A.T. 2015-02-27. Agraulos longicephalus and Proampyx? depressus (Trilobita) from the Middle Cambrian of Bornholm, Denmark.
© 2015 by Bulletin of the Geological Society of Denmark, Vol. 63, pp. 1–11.
ISSN 2245-7070. (www.2dgf.dk/publikationer/bulletin).
https://doi.org/10.37570/bgsd-2015-63-01
Abstract: The trilobite genus Agraulos Hawle & Corda 1847 has within Scandinavia been recorded only from Bornholm, Denmark, where its representatives occur in the Middle Cambrian Paradoxides paradoxissimus Superzone of the Alum Shale Formation. Only cranidia have been found so far, representing Agraulos longicephalus (Hicks 1872) and the rare “Agraulos” depressus Grönwall 1902.
The two species from Bornholm are redescribed and discussed based on museum collections in combination with newly collected material from Borggård, Øleå. Agraulos longicephalus occurs commonly in the lower and upper part of the Acidusus atavus Zone as well as in the Ptychagnostus punctuosus Zone. It closely resembles the coeval Agraulos ceticephalus (Barrande 1846) known from Bohemia and eastern Newfoundland. A lectotype for “Agraulos” depressus is designated and reillustrated; this taxon is hesitantly assigned to Proampyx? It is known only from the Ptychagnostus punctuosus Zone and may represent an early, atypical Proampyx or maybe a precursor that should be separated in a new genus.
Emended diagnoses of Agraulos Hawle & Corda 1847 and Proampyx Frech 1897 are presented.
Keywords: Agraulos, Proampyx, trilobites, Middle Cambrian, Bornholm, Denmark.
Addresses:
Thomas Weidner [ to [dot] we [at] paradis [dot] dk ], Ravnholtvej 23, Rårup, DK-7130 Juelsminde, Denmark.
Arne Thorshøj Nielsen [ arnet [at] snm [dot] ku [dot] dk ], Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5–7, DK-1350 København K, Denmark.
Corresponding author: Arne Thorshøj Nielsen
Book Review: Kardel. T. & Maquet, P. (eds) 2013: Nicolaus Steno. Biography and Original Papers of a 17th. Century Scientist. Springer-Verlag, Berlin, Heidelberg, 739 pp: Finally, all Steno’s scientific papers translated from Latin into English.
Hansen, J.M. 2015-03-28. Finally, all Steno’s scientific papers translated from Latin into English.
© 2015 byBulletin of the Geological Society of Denmark, Vol. 63, pp. 13–15.
ISSN 2245-7070. (www.2dgf.dk/publikationer/bulletin).
https://doi.org/10.37570/bgsd-2015-63-02
Addresses:
Jens Morten Hansen [ jmh [at] geus [dot] dk ], Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark.
Episodes of aeolian sand movement on a large spit system (Skagen Odde, Denmark) and North Atlantic storminess during the Little Ice Age
Clemmensen, L.B., Glad, A.C., Hansen, K.W.T. & Murray, A.S., 2015-04-24. Episodes of aeolian sand movement on a large spit system (Skagen Odde, Denmark) and North Atlantic storminess during the Little Ice Age.
© 2015 by Bulletin of the Geological Society of Denmark, Vol. 63, pp. 17–28.
ISSN 2245-7070. (www.2dgf.dk/publikationer/bulletin).
https://doi.org/10.37570/bgsd-2015-63-03
Abstract: Late Holocene coastal dune successions in north-western Europe contain evidence of episodic aeolian sand movement in the recent past. If previous periods of increased sand movement can be dated sufficiently precisely and placed in a correct cultural and geomorphological context, they may add to our understanding of storminess variation and climate change in the North Atlantic during the later part of the Holocene.
In this study, coastal cliff sections of Holocene dune sand were investigated in the north-western part of the Skagen Odde spit system in northern Denmark. Four units of aeolian sand were recognized. Optically stimulated luminescence (OSL) dating indicates that aeolian sand movement took place in four phases: around AD 1460, between AD 1730 and 1780, around AD 1870, and since about AD 1935.
The first phase of sand movement occurred during cooling in the first part of the Little Ice Age. A change in the atmospheric circulation, so that both the North Atlantic Oscillation (NAO) and the Atlantic Multidecadal Oscillation (AMO) were negative, apparently led to an increased number of intense cyclones causing inland sand movement and dune building. The second and third phase of aeolian sand movement during the Little Ice Age also took place in periods of increased storminess, but during these events it appears that negative NAO values were coupled with positive AMO values. The final phase of sand movement is intimately linked to the modern formation of frontal dunes which takes place during moderate storminess.
These findings are important as they indicate three major periods of aeolian sand movement and storminess during the Little Ice Age.
Keywords: Aeolian sand movement, storminess, climate change, Little Ice Age, Skagen Odde.
Addresses:
Lars B. Clemmensen [ larsc [at] ign [dot] ku [dot] dk ], Aslaug C. Glad [hrm158 [at] alumni [dot] ku [dot] dk], Kristian W.T. Hansen [hansenkw [at] gmail [dot] com], Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark.
Andrew S. Murray [anmu [at] dtu [dot] dk], Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, DTU Risø Campus, DK-4000 Roskilde, Denmark.
Proterozoic basement and Palaeozoic sediments in the Ringkøbing–Fyn High characterized by zircon U–Pb ages and heavy minerals from Danish onshore wells
Olivarius, M., Friis, H., Kokfelt, T.F. & Wilson, J.R. 2015-05-29. Proterozoic basement and Palaeozoic sediments in the Ringkøbing–Fyn High characterized by zircon U–Pb ages and heavy minerals from Danish onshore wells.
© 2015 by Bulletin of the Geological Society of Denmark, Vol 63, pp. 29–44.
ISSN 2245-7070. (www.2dgf.dk/publikationer/bulletin).
https://doi.org/10.37570/bgsd-2015-63-04
Abstract: New data from the Proterozoic basement and scattered Palaeozoic sediments in the Ringkøbing–Fyn High including zircon U–Pb geochronometry, heavy mineral compositions and whole rock geochemistry is presented here to provide a frame of reference for detrital provenance studies.
The Ringkøbing–Fyn High is a WNW–ESE trending structural high including subcropping basement rocks, and the results indicate that it is a southerly extension of the Fennoscandian Shield. The zircon data show matching age distribution patterns in crystalline basement rocks obtained from two drill sites, the Glamsbjerg-1 and Grindsted-1 wells. They both record a characteristic Telemarkian accretionary event at 1.51 and 1.48 Ga and a Sveconorwegian metamorphic overprinting at 1.08 Ga.
Furthermore, the dominant age intervals in the Glamsbjerg High (1.55–1.48 Ga) and the Grindsted High (1.51–1.44 Ga) suggest that rocks of the Gothian orogeny (that ended at 1.52 Ga) are only present in the eastern part of the Ringkøbing–Fyn High. Thus, the buried basement in central Denmark may be youngest towards the west, which is consistent with the general westward age progression trend in the Sveconorwegian Orogen.
The basement breccia in the Arnum-1 well on the southern flank of the Ringkøbing–Fyn High has zircon ages (c. 1.54–1.53 Ga) that resemble those of gneiss in the Glamsbjerg High. The conglomeratic sandstone in the Ringe-1 well on the Glamsbjerg High has a dual age distribution as the matrix has late Palaeoproterozoic to early Mesoproterozoic ages, whereas the granitic clasts have a distinct middle Neoproterozoic age (c. 0.76 Ga) that may indicate an Avalonian source. The quartzite in the Slagelse-1 well on the northern flank of the Ringkøbing–Fyn High has a broad age span with late Palaeoproterozoic to late Mesoproterozoic zircon ages.
Supplementary material: Detailed documentation of U/Pb analytical procedures, results and analysed zircon spots are available below.
Keywords: Ringkøbing–Fyn High, detrital zircon provenance, Proterozoic basement, Palaeozoic sediments, zircon U–Pb age dating, heavy mineral analysis, Denmark.
Addresses:
Mette Olivarius [ mol [at] geus [dot] dk ], Thomas F. Kokfelt [ tfk [at] geus [dot] dk ], Geological Survey of Denmark and Greenland (GEUS), Øster Voldgade 10, DK-1350 Copenhagen K, Denmark.
Henrik Friis [ henrik [dot] friis [at] geo [dot] au [dot] dk ], J. Richard Wilson [ jrw [at] geo [dot] au [dot] dk ], also Mette Olivarius, Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, DK-8000 Aarhus C, Denmark
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Download analytical procedures of zircon U/Pb analyses by LA-ICP-MS:
Supplementary data file 1 – pdf-file (135,63 Kb)
Download LA‐SF‐ICP‐MS U/Pb dating methodology at GEUS, Copenhagen :
Supplementary data file 1 – pdf-file (98,21 Kb)
Download LA-ICPMS U/Pb zircon data on drill core samples from Ringkøbing-Fyn High:
Supplementary data file 1 – xls-file (411,70 Kb)
Download U–Pb shot point locations in zircon grains :
Supplementary data file 1 – pdf-file (9,30 Mb)
The first evidence of trace fossils and pseudo-fossils in the continental interlava volcaniclastic sediments on the Faroe Islands
Pokorný, R., Krmíček, L. & Árting, U.E. 2015-11-12. The first evidence of trace fossils and pseudo-fossils in the continental interlava volcaniclastic sediments on the Faroe Islands.
© 2015 by Bulletin of the Geological Society of Denmark, Vol 63, pp. 45–57.
ISSN 2245-7070. (www.2dgf.dk/publikationer/bulletin).
https://doi.org/10.37570/bgsd-2015-63-05
Abstract: Interlava volcaniclastic sediments, mostly sandstones, from the Palaeogene Faroe Islands Basalt Group (Malinstindur and Sneis Formations) contain rare ichnofauna and well-preserved pseudofossils in the form of linear structures. Five specimens of two ichnogenera have been identified, which include Helminthoidichnites isp. and ?Palaeophycus isp. The linear structures are interpreted to be desiccation cracks. This association indicates an environment with low to moderate hydrodynamic energy, which confirms a mosaic landscape of floodplains with rivers and shallow lakes.
Keywords: Faroe Islands, trace fossils, pseudo-fossils, volcaniclastic sediments.
Addresses:
Richard Pokorný [ richard [dot] pokorny [at] ujep [dot] cz ], Jan Evangelista Purkyně University, Faculty of Environment, Králova Výšina 3132/7, 40096 Ústí nad Labem, Czech Republic.
Lukáš Krmíček [ l [dot] krmicek [at] gmail [dot] com ], Brno University of Technology, Faculty of Civil Engineering, AdMaS Centre, Veveří 95, CZ-602 00 Brno, Czech Republic (also Institute of Geology, v.v.i., Czech Academy of Sciences, Rozvojová 269, CZ-165 02 Prague 6, Czech Republic).
Uni E. Árting [ Uni [dot] Arting [at] jardfeingi [dot] fo], Jarðfeingi, Brekkutún 1, Postsmoga 3059, FO 110 Tórshavn, Faroe Islands.
Glacial erratic boulders from Jutland, Denmark, feature an uppermost lower Cambrian fauna of the Lingulid Sandstone Member of Västergötland, Sweden.
Weidner, T., Geyer, G., Ebbestad, J. O. R. & von Seckendorff, V. 2015-12-04. Glacial erratic boulders from Jutland, Denmark, feature an uppermost lower Cambrian fauna of the Lingulid Sandstone Member of Västergötland, Sweden.
© 2015 by Bulletin of the Geological Society of Denmark, Vol. 63, p. 59-86.
ISSN 2245-7070. (www.2dgf.dk/publikationer/bulletin).
https://doi.org/10.37570/bgsd-2015-63-06
Abstract: Reinvestigation of glacial erratic boulders from Jutland, Denmark, and from northern Germany, has revealed a moderately diverse fauna with the trilobites Holmiella? sp., Epichalnipsus anartanus, Epichalnipsus sp. A, Epichalnipsus sp. B, and Berabichia erratica, three species of lingulid brachiopods, one hyolith species, and trace fossils comparable to Halopoa imbricata.
Comparison with faunas from the Cambrian of Scandinavia strongly suggested a biostratigraphic position equivalent to the uppermost part of the (revised) Holmia kjerulfi–‘Ornamentaspis’ linnarssoni to lowermost Comluella?–Ellipsocephalus lunatus zones sensu Nielsen & Schovsbo (2011), or the lower to middle part of the traditional ‘Ornamentaspis’ linnarssoni Zone, but probably a particular horizon and biofacies not yet discovered in Scandinavia.
Considerations of glacial transport regimes and the distribution of comparable rock units, as well as a petrographical analysis of the material from the studied erratic boulders and rocks from outcrops in Sweden, indicate that the boulders were derived from the Lingulid Sandstone Member of the File Haidar Formation and the source area is situated in the vicinity of the present-day outcrops in the Halleberg–Hunneberg area, Västergötland, Sweden.
Keywords: Trilobites, Lingulid Sandstone Member, lower Cambrian, Cambrian Series 2, Västergötland,Sweden, Denmark, biostratigraphy, glacial boulders.
Addresses:
Thomas Weidner [ to [dot] we [at] paradis [dot] dk ], Ravnholtvej 23, Rårup, DK-7130 Juelsminde, Denmark.
Gerd Geyer [ gerd [dot] geyer [at] uni-wuerzburg [dot] de ], Institut für Geographie und Geologie, Lehrstuhl für Geodynamik und Geomaterialforschung, Bayerische Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
Jan Ove R. Ebbestad [jan-ove [dot] ebbestad [at] em [dot] uu [dot] se], Museum of Evolution, Uppsala University, SE-75236 Uppsala, Sweden.
Volker von Seckendorff [volker [dot] von_seckendorff [at] uni-wuerzburg [dot] de], Institut für Geographie und Geologie, Lehrstuhl für Geodynamik und Geomaterialforschung, Bayerische Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
Corresponding author: Gerd Geyer
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