Bulletin of the Geological Society of Denmark最新文献

{"title":"Triassic lithostratigraphy of the Jameson Land Basin (central East\u0000Greenland), with emphasis on the new Fleming Fjord Group","authors":"L. Clemmensen, Dennis Kent, M. Mau, O. Mateus, J. Milán","doi":"10.37570/bgsd-2020-68-05","DOIUrl":"https://doi.org/10.37570/bgsd-2020-68-05","url":null,"abstract":"The lithostratigraphy of the Triassic deposits of the Jameson Land Basin in\u0000central East Greenland is revised. The new Scoresby Land Supergroup is now\u0000composed of the Wordie Creek, Pingo Dal, Gipsdalen and Fleming Fjord Groups.\u0000This paper only deals with the lithostratigraphy of the late Early-Late Triassic\u0000continental deposits of the latter three groups with emphasis on the vertebratebearing\u0000Fleming Fjord Group. The new Pingo Dal Group consists of three new\u0000formations, the Rødstaken, Paradigmabjerg and Klitdal Formations (all elevated\u0000from members), the new Gipsdalen Group consists of three new formations,\u0000the Kolledalen, Solfaldsdal (with the new Gråklint Member) and Kap Seaforth\u0000Formations (all elevated from members), and the new Fleming Fjord Group is\u0000subdivided into three new formations, the Edderfugledal, Malmros Klint and\u0000Ørsted Dal Formations (all elevated from members). The Edderfugledal Formation\u0000contains two cyclic bedded, lacustrine members, a lowermost Sporfjeld Member\u0000(elevated from beds), and an uppermost Pingel Dal Member (elevated from beds).\u0000The lacustrine red beds of the Malmros Klint Formation are not subdivided. The\u0000lacustrine and fluvial Ørsted Dal Formation contains three new members. In the\u0000eastern and central part of the basin, the formation is initiated by cyclic bedded,\u0000red lacustrine mudstones of the Carlsberg Fjord Member (elevated from beds),\u0000while in the northwestern part of the basin the lowermost part of the formation\u0000is composed of grey fluvial conglomerates and sandstones with subordinate red\u0000mudstones of the Bjergkronerne Member (elevated from beds). The uppermost part\u0000of the formations in most of the basin is composed of cyclic bedded, variegated\u0000lacustrine mudstones and grey to yellowish marlstones of the Tait Bjerg Member\u0000(elevated from beds). The sediments in the Fleming Fjord Group contain remains\u0000of a rich and diverse vertebrate fauna including dinosaurs, amphibians, turtles,\u0000aeotosaurs, pterosaurs, phytosaurs and mammaliaforms. Most vertebrate bones\u0000have been found in uppermost Malmros Klint Formation, and in the Carlsberg\u0000Fjord and Tait Bjerg Members. The Norian–early Rhaetian, lacustrine Fleming\u0000Fjord Group was deposited at about 41° N on the northern part of the supercontinent\u0000Pangaea. Lacustrine sedimentation was controlled by seasonal as well as\u0000longer-term (orbital) variation in precipitation. Precipitation was probably brought\u0000to the basin by southwesterly winds. The lacustrine sediments of the uppermost\u0000Fleming Fjord Group show deposition during increasingly humid conditions\u0000changing the lake environment from an ephemeral lake-steppe area to a perennial\u0000lake. This evolution of lake environment suggests a change from a winter-wet\u0000temperate climate to one with precipitation throughout the year.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41469957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cretaceous lithostratigraphy of North-East Greenland","authors":"M. Bjerager, P. Alsen, J. Bojesen‐Koefoed, M. Fyhn, J. Hovikoski, J. Ineson, H. Nøhr-Hansen, L. Nielsen, S. Piasecki, H. Vosgerau","doi":"10.37570/bgsd-2020-68-04","DOIUrl":"https://doi.org/10.37570/bgsd-2020-68-04","url":null,"abstract":"An updated and revised lithostratigraphic scheme is presented for the Cretaceous of North-East Greenland from Traill Ø in the south to Store Koldewey in the north. The Ryazanian to lower Maastrichtian succession is up to several kilometres thick and comprises four groups, 12 formations and 18 members. The groups record the tectonic evolution of the East Greenland depocentre on the western flank of the evolving proto-Atlantic seaway. The Wollaston Forland Group encompasses the uppermost Jurassic – lowermost Cretaceous rift-climax succession and contains the Lindemans Bugt and Palnatokes Bjerg Formations; two new members of the latter formation are erected from Store Koldewey. Post-rift Cretaceous strata are referred to the new Brorson Halvø Group and the Home Forland Group. The Brorson Halvø Group (uppermost Hauterivian – middle Albian) is dominated by slope and basinal mudstones of the new Stratumbjerg Formation but also includes fluvio-deltaic and shallow marine sandstones of the revised Steensby Bjerg Formation on northern Hold with Hope and submarine slope apron breccias and conglomerates of the revised Rold Bjerge Formation on Traill Ø. The Home Forland Group covers the middle Albian – Coniacian succession. The basal unconformity records an important mid-Albian tectonic event involving intrabasinal uplift, tilting and erosion, as exemplified by the middle Albian conglomerates of the new Kontaktravine Formation on Clavering Ø. The Home Forland Group is dominated regionally by mud-dominated slope to basinal deposits of the elevated and revised Fosdalen Formation; it also includes lowstand basin-floor fan sandstones of the new upper Albian Langsiden Member. The new Jackson Ø Group (upper Turonian – lower Maastrichtian), records a phase of basin reorganisation marked by a significant fall in sedimentation rate in North-East Greenland, probably linked to rift events in, and bypass to, the central proto-Atlantic rift system. The base of the group is an erosional unconformity on Traill Ø and Geographical Society Ø overlain by submarine slope-apron conglomerates of the Turonian Månedal Formation. The base is conformable on Hold with Hope but is defined by a condensed interval (the Coniacian Nanok Member) that is succeeded conformably by slope and basin-floor turbidite sandstones of the Coniacian–Santonian Østersletten Formation and slope to basinal mudstones of the Campanian – lower Maastrichtian Knudshoved Formation. The new Leitch Bjerg Formation of Campanian slope-apron conglomerates and sandstones in eastern Geographical Society Ø erosionally overlies the Knudshoved Formation.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41985619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Palaeogene glendonites from Denmark","authors":"B. Schulz, Madeleine L. Vickers, J. Huggett, H. Madsen, C. Heilmann-Clausen, H. Friis, E. Suess","doi":"10.37570/bgsd-2020-68-03","DOIUrl":"https://doi.org/10.37570/bgsd-2020-68-03","url":null,"abstract":"Pristinely preserved mineral pseudomorphs called glendonites, up to 1.6 m long, from the Palaeogene strata of Denmark allow detailed crystallographic characterisation and add to the understanding of the transformation of the precursor mineral, ikaite (CaCO3·6H2O), to calcite, which constitutes the glendonite. We describe Danish pseudomorphs after ikaite from two localities and formations: the Early Eocene Fur Formation and the Late Oligocene Brejning Formation. This detailed study highlights that key aspects such as morphology and mode of occurrence of these ancient glendonites are identical to those of their parent mineral ikaite, when it grows in marine sediments. Systematic distortion of the angles in glendonite and marine sedimentary ikaite relative to the ideal ikaite symmetry may arise due to the incorporation of organic matter into the crystal structure, and we demonstrate the similarity between modern and ancient ikaite formation zones in the marine sedimentary realm with respect to organic matter.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49292613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Provenance of Medieval atlantes in the Ribe Cathedral, Denmark, based on geological and palaeontological investigations","authors":"Ebbe Nyborg, F. Surlyk, N. Thibault","doi":"10.37570/bgsd-2020-68-02","DOIUrl":"https://doi.org/10.37570/bgsd-2020-68-02","url":null,"abstract":"An atlante is a corbel figure (or pillar support) sculpted in the form of a man carrying\u0000a heavy load. A group of well-preserved stone carved atlantes from c. 1250 carrying\u0000the vaults of the Ribe Cathedral in western Jylland, Denmark, represents the antique\u0000titan Atlas and are up to 150 cm high. Their obviously foreign origin has so far remained\u0000uncertain. The figures are made of a relatively soft, sandy limestone. A new\u0000nannofossil analysis of small chips of the chalky and sandy limestone narrows the age\u0000of the stone down to the late Campanian (Late Cretaceous). Upper Campanian sandy\u0000limestones of this type are exposed in the Münster Basin in North Rhine-Westphalia,\u0000western Germany. The Campanian Baumberger Sandstein in this region fits well\u0000with the atlantes in terms of lithology and age and is the only possible provenance\u0000of the stone. Around 1250 the Baumberger Sandstein was used for baptismal fonts\u0000as far north as Ostfriesland at the Dutch-German border, and it is a novel finding of\u0000this investigation that it even reached Denmark. The stone was most likely floated\u0000along the rivers Lippe and Rhine and shipped via the Wadden Sea to Ribe. It is a\u0000remarkably long transport distance for historic commercial stone transportation in\u0000continental northern European art in the High Middle Ages.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46549131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Middle Cambrian trilobites (Miaolingian, Ehmaniella Biozone) from the Telt Bugt Formation of Daugaard-Jensen Land, western North Greenland","authors":"J. S. Peel","doi":"10.37570/bgsd-2020-68-01","DOIUrl":"https://doi.org/10.37570/bgsd-2020-68-01","url":null,"abstract":"A small fauna of middle Cambrian trilobites is described from the upper Telt Bugt Formation of Daugaard-Jensen Land, western North Greenland, and the formation is formally defined. Blainiopsis holt ...","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69890258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Triassic lithostratigraphy of the Wandel Sea Basin, North Greenland","authors":"Morten Bjergager, P. Alsen, J. Hovikoski, S. Lindström, Anders Pilgaard, L. Stemmerik, J. Therkelsen","doi":"10.37570/bgsd-2019-67-06","DOIUrl":"https://doi.org/10.37570/bgsd-2019-67-06","url":null,"abstract":"The Wandel Sea Basin in eastern North Greenland forms the northern continuation of the offshore Danmarkshavn Basin and the conjugate margin to the western Barents Shelf south of Spitsbergen. The Triassic succession of eastern North Greenland, up to 700 m thick, spans the Induan (Dienerian) – Norian. The Triassic sediments rest unconformably on Upper Carboniferous and Upper Permian sediments, and are unconformably overlain by Upper Jurassic – Lower Cretaceous deposits. Based on recent fieldwork in the Wandel Sea Basin, five new and revised Triassic formations are described and included in the Trolle Land Group (revised). The Lower Triassic (Induan) Parish Bjerg Formation (revised) consists of marine sandstones, fluvial conglomerates and sandstones, and muddy flood-plain deposits. It is conformably overlain by Lower Triassic (Dienerian – lower Spathian) offshore mudstones with minor sand-dominated intervals of the Ugleungernes Dal Formation (new). The upper Spathian to Ladinian Dunken Formation (revised) is represented mainly by marine sandstones. A marked erosional unconformity characterises the base of the overlying Upper Triassic (Carnian – Norian) Storekløft Formation (new) composed of marginal marine to marine, massive sandstones and conglomerates as well as cross-bedded and biomottled marine sandstones and minor mudstone units. The Isrand Formation (mainly Middle Triassic) consists of laminated mudstones with minor thin sandstone units that were deposited in slope and basin floor settings in the eastern deeper part of the Wandel Sea Basin in Kronprins Christian Land. The Triassic succession of the Wandel Sea Basin represents a well-constrained shallow shelf to deep shelf / basin floor transect and thus forms an excellent outcrop analogue to the time-equivalent intervals in the western Barents Sea basins and the Danmarkshavn Basin offshore North-East Greenland.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2019-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47552298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of the western Limfjord, Denmark, after the last deglaciation: a review with new data","authors":"O. Bennike, N. Nørgaard‐Pedersen, J. Jensen, K. Andresen, M. Seidenkrantz","doi":"10.37570/bgsd-2019-67-04","DOIUrl":"https://doi.org/10.37570/bgsd-2019-67-04","url":null,"abstract":"This paper presents new marine evidence of Lateglacial and Holocene environmental changes in the western part of Limfjorden, and provides a review of the geological history/development of this part of northern Jylland, Denmark. Lateglacial clay without fossils is widespread in the region and is probably a glaciolacustrine deposit. Limfjorden began to form as a strait in the Early Holocene due to rising relative sea level and the oldest marine shells are dated to c. 9300 cal. years BP. We propose a new relative sealevel curve for the region based on new and published data, which appear to confirm that the relative sea-level change was not extremely rapid, which was suggested earlier. During the Mid-Holocene a wide connection existed from the western part of Limfjorden to the North Sea in the west and more narrow connections existed between Limfjorden and Skagerrak in the north. The marine fauna included several species that indicate warmer and more salty waters than at present. Gradually, the connections to the North Sea and Skagerrak closed due to long-shore sediment transport and deposition of aeolian sand combined with a fall in the relative sea level during the Middle- to Late Holocene. During the Viking Age, 800–1050 CE (Common Era), the western connection to the North Sea was still open, but around 1200 CE it was closed by a coastal sandy barrier and the western part of Limfjorden became brackish. The coastal barrier was flooded on several occasions but soon formed again. After 1825 CE the western connection from Limfjorden to the North Sea has been maintained artificially.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2019-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42856977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"First record of Epicymatoceras vaelsense (Nautilida) from the Maastrichtian white chalk of northern Denmark","authors":"O. Malchyk, M. Machalski","doi":"10.37570/bgsd-2018-66-14","DOIUrl":"https://doi.org/10.37570/bgsd-2018-66-14","url":null,"abstract":"The atypical Late Cretaceous nautilid Epicymatoceras vaelsense (Binkhorst van den Binkhorst, 1862) is described and illustrated on the basis of three specimens from the Maastrichtian white chalk of Denmark. One of these is probably from the lower/upper Maastrichtian boundary interval at Frejlev, while the other two originate from the uppermost Maastrichtian chalk as exposed in the Dania quarry; both localities are in Jylland, northern Denmark. These are first reports of E. vaelsense from Denmark; the species has previously been recorded from the uppermost Campanian and lower Maastrichtian of the Netherlands, Belgium, northern Germany and Poland. The presence of E. vaelsense in the topmost Maastrichtian white chalk in the Dania quarry is considered the youngest record of Epicymatoceras known to date, suggesting the persistence of the genus until the end of the Cretaceous. The diameter of the embryonic conch of the Danish E. vaelsense may be estimated at c. 30 mm, based on an individual from the Dania quarry, confirming earlier observations that the species possessed one of the largest embryonic conchs amongst Late Cretaceous nautilids.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2018-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43903451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anopolenus henrici Salter, a middle Cambrian (Drumian) centropleurid trilobite from the Alum Shale Formation of Scandinavia","authors":"Thomas Weidner, J. R. Ebbestad","doi":"10.37570/bgsd-2018-66-13","DOIUrl":"https://doi.org/10.37570/bgsd-2018-66-13","url":null,"abstract":"Centropleurid trilobites include five genera of which Centropleura Angelin, Anopolenus Salter, Clarella Howell and Luhops Šnajdr are known from eight species in the traditional middle Cambrian (Miaolingian Series, Drumian Stage) of Sweden and Denmark (Bornholm). Beishanella Xiang & Zhang has not been recorded in Scandinavia so far, and no centropleurids have been reported from Norway. Of these taxa, only Centropleura is common in Scandinavia. Two pygidia previously identified as Centropleura sp. and Anopolenus sp. from erratics in Germany and Bornholm, respectively, as well as a new pygidum from Scania in Sweden are here identified as Anopolenus henrici Salter. Elsewhere, the species is known from Wales, Avalonian Canada, Siberia, Alaska, and Sardinia, occurring in the A. atavus and P. punctuosus zones (the former in Siberia only). The presence of this species increases the known diversity of Centropleuridae in Scandinavia and is important for correlation between Baltica and Avalonia.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2018-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46465722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Book Review: Fischer, A. & Pedersen, L. (eds) 2018: Oceans of Archaeology.","authors":"O. Bennike","doi":"10.37570/bgsd-2018-66-12","DOIUrl":"https://doi.org/10.37570/bgsd-2018-66-12","url":null,"abstract":"","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2018-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49245005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}