scholarly journals Pollen and spore events from the marine Tertiary of North Europe

1986 ◽  
Vol 5 (2) ◽  
pp. 75-84 ◽  
Author(s):  
M. C. Boulter
Keyword(s):  
North Sea ◽  
Middle Miocene ◽  
Late Eocene ◽  
The Other ◽  
Early Miocene ◽  
Small Range ◽  
Early Eocene ◽  
Norwegian Sea ◽  
Angiosperm Pollen ◽  
Central North Sea

Abstract. Results are presented of semi-quantitative palynological analyses from two cored boreholes. One is from the central North Sea (16/1-1) and penetrates sediments from the Middle Miocene to the Palaeocene. The other is from the Voring Plateau of the Norwegian Sea (D.S.D.P. Leg 38 site 338) and penetrates sediments from the Early Miocene to the Early Eocene. The results show a number of interesting palynological features and these are discussed in relation to other evidence. The most important of these are: 1, the small range of angiosperm pollen in the Palaeocene; 2, changes in the dinocyst:pollen ratio in Early Eocene sediments in both cores at about the time of an increase in Subtriporopollenites pollen; 3, the presence of triprojectate pollen in the Late Eocene and Middle Oligocene sediments of site 338 some of which may not be reworked; and 4, a clear difference between Neogene and Palaeogene pollen taxa.

scholarly journals Late Cenozoic palaeogeography of the eastern North Sea Basin: climatic vs tectonic forcing of basin margin uplift and deltaic progradation

2002 ◽  
Vol 49 ◽  
pp. 145-170
Author(s):  
Mads Huuse
Keyword(s):  
North Sea ◽  
Middle Miocene ◽  
Late Eocene ◽  
Middle Pleistocene ◽  
Tectonic Events ◽  
Erosional Unloading ◽  
Southern Norway ◽  
Uplift And Erosion ◽  
Basin Margin ◽  
Passive Model

The late Eocene to middle Pleistocene development of the eastern North Sea Basin is described by a series of palaeogeographic maps. The maps are based on published information integrated with recent investigations of seismic and well data from the eastern North Sea. The maps provide overviews of the basin geometry at late Eocene, late Oligocene, middle Miocene, late Miocene, late Pliocene and middle Pleistocene time. In post-Eocene time, the eastern and central North Sea Basin was progressively filled by large deltas, which built out from the eastern basin margin. These deltas were fed by ancient rivers from southern Norway (late Paleocene-Oligocene and Pliocene), southern Norway and Sweden (early Miocene), the Baltic region (middle Miocene-early Pleistocene), and finally by rivers flowing northward through the northwest European lowland (middle Pleistocene). It is argued that the Cenozoic evolution of the eastern North Sea Basin may be explained by a ‘self-perpetuating’ passive model. This model involves isostatic uplift of source areas due to erosional unloading of a relief generated by early Palaeogene uplift. The erosional unloading accelerated at the Eocene/Oligocene transition, in the middle Miocene and in the Plio-Pleistocene corresponding to periods of global climatic cooling and long-term eustatic lowering as indicated by δ18O records. The passive model diminishes the need for hypothetical Neogene tectonic events, although the influence of tectonic events cannot be excluded. Previous estimates of Neogene uplift and erosion of the northeastern Danish North Sea of the order of 500–1000 m do not agree with seismic geometries or with the regional palaeogeographic development. This indicates that previous estimates of Neogene uplift and erosion of the northeastern Danish North Sea may be several hundred metres too high.

Tertiary marine molluscan assemblages of eastern Patagonia (Argentina): A biostratigraphic analysis

2004 ◽  
Vol 78 (6) ◽  
pp. 1097-1122 ◽  
Author(s):  
Claudia Julia del Río
Keyword(s):  
Late Miocene ◽  
Middle Miocene ◽  
Late Eocene ◽  
Early Miocene ◽  
Late Oligocene ◽  
Late Paleocene ◽  
Compositional Changes ◽  
Molluscan Species

Pectinids are the most abundant and widely distributed taxa in the Tertiary marine beds of Patagonia. Along with other very common molluscan species, they characterize five assemblages, from oldest to youngest: 1) the Oligocene Panopea sierrana-Parinomya patagonensis Assemblage; 2) the Late Oligocene–Early Miocene Jorgechlamys centralis–Reticulochlamys borjasensis Assemblage; 3) the Early Miocene Reticulochlamys zinsmeisteri–Struthiolarella patagoniensis–Pleuromeris cruzensis Assemblage; 4) the Early Miocene Pseudoportlandia glabra–Antimelatoma quemadensis Assemblage; and 5) the latest Early Miocene–earliest Middle Miocene Nodipecten sp.–Venericor abasolensis–Glycymerita camaronesia Assemblage. A brief analysis of the origin and composition of these Tertiary Patagonian molluscan faunas is provided. Striking compositional changes occurred through time, recorded mainly in the Late Paleocene, Late Eocene, Late Oligocene–Early Miocene, and Late Miocene.

scholarly journals Magnetostratigraphic Chronology of a Cenozoic Sequence From DSDP Site 274, Ross Sea, Antarctica

2020 ◽  
Vol 8 ◽  
Author(s):  
Luigi Jovane ◽  
Fabio Florindo ◽  
Gary Wilson ◽  
Stephanie de Almeida Pecchiai Saldanha Leone ◽  
Muhammad Bin Hassan ◽  
...  
Keyword(s):  
Middle Miocene ◽  
Ross Sea ◽  
Sediment Accumulation ◽  
Late Eocene ◽  
Early Miocene ◽  
Accumulation Rates ◽  
Age Model ◽  
Circumpolar Current ◽  
Geomagnetic Polarity ◽  
Geomagnetic Polarity Time Scale

New paleomagnetic results from the late Eocene-Middle Miocene samples from Deep Sea Drilling Project Site 274, cored during Leg 28 on the continental rise off Victoria Land, Ross Sea, provide a chronostratigraphic framework for an existing paleoclimate archive during a key period of Antarctic climate and ice sheet evolution. Based on this new age model, the cored late Eocene-Middle Miocene sequence covers an interval of almost 20 Myr (from ∼35 to ∼15 Ma). Biostratigraphic constraints allow a number of possible correlations with the Geomagnetic Polarity Time Scale. Regardless of correlation, average interval sediment accumulation rates above 260 mbsf are ∼6 cm/kyr with the record punctuated by a number of unconformities. Below 260 mbsf (across the Eocene/Oligocene boundary) interval, sedimentation accumulation rates are closer to ∼1 cm/kyr. A major unconformity identified at ∼180 mbsf represents at least 9 Myr accounting for the late Oligocene and Early Miocene and represent non-deposition and/or erosion due to intensification of Antarctic Circumpolar Current activity. Significant fluctuations in grain size and magnetic properties observed above the unconformity at 180 mbsf, in the Early Miocene portion of this sedimentary record, reflect cyclical behavior in glacial advance and retreat from the continent. Similar glacial cyclicity has already been identified in other Miocene sequences recovered in drill cores from the Antarctic margin.

scholarly journals Two new Early Cretaceous dinocyst species from the Central North Sea Basin

2002 ◽  
Vol 21 (1) ◽  
pp. 75-80 ◽  
Author(s):  
S. Duxbury
Keyword(s):  
New Species ◽  
North Sea ◽  
Early Cretaceous ◽  
Lower Cretaceous ◽  
Early Miocene ◽  
Late Oligocene ◽  
Two New Species ◽  
Central North Sea

Abstract. Two new species of dinocyst, Cerbia monilis and Hapsocysta susanae are described from the Lower Cretaceous of the Central North Sea Basin. The first ranges across the Aptian/Albian boundary and the latter is restricted to the Early to Middle Albian interval; both are valuable index taxa in this area. Hapsocysta susanae is remarkably similar to cysts ‘without walls’ described from the Late Oligocene and Early Miocene, and detailed comparisons are made. The ranges of the two species described here are illustrated against regional lithostratigraphic and biostratigraphic schemes.

scholarly journals Miocene sepiids (Cephalopoda, Coleoidea) from Australia

Fossil Record ◽  
2017 ◽  
Vol 20 (2) ◽  
pp. 159-172 ◽  
Author(s):  
Martin Košt'ák ◽  
Andrej Ruman ◽  
Ján Schlögl ◽  
Natalia Hudáčková ◽  
Dirk Fuchs ◽  
...  
Keyword(s):  
Southern Hemisphere ◽  
Fossil Record ◽  
Middle Miocene ◽  
Late Eocene ◽  
Early Miocene ◽  
Type Ii ◽  
Late Oligocene ◽  
Biogeographical Distribution ◽  
Stem Lineage ◽  
Migratory Route

Abstract. Two sepiid genera, Notosepia Chapman, 1915, and Sepia Linnaeus, 1758, are described from the Neogene deposits of Australia. A new and unique record of the middle Miocene Sepia sp. is reported from southern Australia. Based on similarities to contemporaneous sepiids, the new sepiid cuttlebone described herein belongs to the genus Sepia. Notosepia cliftonensis is suggested herein to be a descendant of the archaeosepiid stem lineage. Microstructures (lamella-fibrillar nacre is the nacre Type II of septa and pillar prismatic layers) of the excellently preserved cuttlebone of Sepia sp. display a modern character of the phragmocone, fully comparable to the recent taxa. The stratigraphically well-calibrated (based on foraminifera) cuttlebone represents the first unambiguous fossil record of the genus Sepia from the Southern Hemisphere. It significantly extends the biogeographical distribution of modern sepiids in the Miocene and suggests the existence of a sepiid eastward migratory route. Moreover, the presence of both conservative- and modern-type cuttlebones suggests a dual colonisation of Australian waters: the first (archaeosepiid) during the late Eocene–late Oligocene and the second (sepiid) during the early Miocene.

scholarly journals Dinoflagellate cysts and acritarchs from the Miocene Zonderschot sands, northern Belgium: stratigraphic significance and correlation with contiguous areas

2001 ◽  
Vol 3 (1-2) ◽  
pp. 55-65 ◽  
Author(s):  
Stephen LOUWYE
Keyword(s):  
North Sea ◽  
Marine Environment ◽  
Middle Miocene ◽  
Type Locality ◽  
Early Miocene ◽  
Dinoflagellate Cysts ◽  
Shallow Marine ◽  
Dinoflagellate Cyst ◽  
Marine Realm ◽  
Oceanic Species

A palynological investigation of the Miocene Zonderschot Sands (Berchem Formation) from the type locality Zonderschot (northern Belgium) has revealed the presence of a diverse dinoflagellate cyst and acritarch association. The dinoflagellates reflect a shallow marine environment, although the oceanic species Nematosphaeropsis and Impagidinium are prominent in the association and indicate the presence of an oceanic influence. This can be explained only by the depositional area being located at the very southern margin of the relatively isolated North Sea Basin during a period of maximum landward extent of the marine realm. A precise biostratigraphical correlation of the Zonderschot Sands with the Antwerpen Sands (Berchem Formation) from the Antwerp area is established. Biostratigraphical evaluation of key dinoflagellate cyst species indicates a latest Burdigalian (latest Early Miocene) - (earliest?) Langhian (early Middle Miocene) age for the Zonderschot Sands.

scholarly journals Eocene tarpons from the North Sea region, Denmark and UK

2015 ◽  
Author(s):  
Maria E. C. Leal ◽  
Bo P. Schultz ◽  
Henrik Madsen ◽  
Chiara Villa ◽  
Niels Lynnerup ◽  
...  
Keyword(s):  
North Sea ◽  
Late Jurassic ◽  
Late Eocene ◽  
Biological Anthropology ◽  
Early Eocene ◽  
The North ◽  
Lower Jaw ◽  
The North Sea ◽  
London Clay ◽  
Cretaceous Period

There are very few tarpons (family Megalopidae) and other elopiforms (fam. Elopidae) recorded in the Tertiary. The records are mainly from the Eocene, and more abundant in the ‘North Sea Region’ in Early Eocene, as for instance the large Danish forms. They are also found in late Early Eocene in London Clay, in Late Eocene in Caucasia, and in Miocene of SE-Asia, although none were described from the famous Bolca fauna (early Mid Eocene). However, there is a large, still undescribed ‘tarpon-like’ fish in the Bolca Museum (obs. MECL & NB 2014). There are even fewer described from the long Cretaceous period, 4-5? genera, including the large Paraelops from Romualdo Formation, Araripe Basin, NE-Brazil, and a large undescribed megalopid from Tlayua, Pueblo, Mexico, both ‘Mid Cretaceous’. The oldest elopiforms are from Late Jurassic Solnhofen Limestone. The large Danish ‘tarpons’ come from ‘cementstones’ in Fur Formation (earliest Eocene, ca. 55 m.y.), and here we report an almost complete specimen which is ca. 110 cm long; however, big isolated scales found in this formation indicate fishes at least twice as big (comparable in size with the living Tarpon atlanticus - over 2½ m). This specimen has a heavy skull lacking the lower jaw, and is preserved in 3-D. It was split in the midline and acid prepared, being then CT-scanned in Aarhus and reconstructed in the Laboratory of Biological Anthropology, Copenhagen University to attempt precise, detailed comparisons with modern skulls and with the 3-D skulls preserved in concretions from the London Clay.

scholarly journals Eocene tarpons from the North Sea region, Denmark and UK

2015 ◽  
Author(s):  
Maria E. C. Leal ◽  
Bo P. Schultz ◽  
Henrik Madsen ◽  
Chiara Villa ◽  
Niels Lynnerup ◽  
...  
Keyword(s):  
North Sea ◽  
Late Jurassic ◽  
Late Eocene ◽  
Biological Anthropology ◽  
Early Eocene ◽  
The North ◽  
Lower Jaw ◽  
The North Sea ◽  
London Clay ◽  
Cretaceous Period

There are very few tarpons (family Megalopidae) and other elopiforms (fam. Elopidae) recorded in the Tertiary. The records are mainly from the Eocene, and more abundant in the ‘North Sea Region’ in Early Eocene, as for instance the large Danish forms. They are also found in late Early Eocene in London Clay, in Late Eocene in Caucasia, and in Miocene of SE-Asia, although none were described from the famous Bolca fauna (early Mid Eocene). However, there is a large, still undescribed ‘tarpon-like’ fish in the Bolca Museum (obs. MECL & NB 2014). There are even fewer described from the long Cretaceous period, 4-5? genera, including the large Paraelops from Romualdo Formation, Araripe Basin, NE-Brazil, and a large undescribed megalopid from Tlayua, Pueblo, Mexico, both ‘Mid Cretaceous’. The oldest elopiforms are from Late Jurassic Solnhofen Limestone. The large Danish ‘tarpons’ come from ‘cementstones’ in Fur Formation (earliest Eocene, ca. 55 m.y.), and here we report an almost complete specimen which is ca. 110 cm long; however, big isolated scales found in this formation indicate fishes at least twice as big (comparable in size with the living Tarpon atlanticus - over 2½ m). This specimen has a heavy skull lacking the lower jaw, and is preserved in 3-D. It was split in the midline and acid prepared, being then CT-scanned in Aarhus and reconstructed in the Laboratory of Biological Anthropology, Copenhagen University to attempt precise, detailed comparisons with modern skulls and with the 3-D skulls preserved in concretions from the London Clay.

scholarly journals Late Cenozoic basin development of the eastern North Sea Basin

1996 ◽  
Vol 43 ◽  
pp. 9-21
Author(s):  
Olaf Michelsen
Keyword(s):  
North Sea ◽  
Late Eocene ◽  
The North ◽  
Early Oligocene ◽  
Late Middle Miocene ◽  
Transport Direction ◽  
Near Shore ◽  
The North Sea ◽  
Central North Sea ◽  
First Time

The Cenozoic succession in the Danish part of the North Sea Basin includes two significant breaks in sedimentation; 1) at the Eocene-Oligocene boundary and 2) at mid Miocene time. The sediment transport direction was from the west during the Middle-Late Eocene and mainly from northeast and east in post Eocene times, and a change from a concordant seismic reflection pattern to a progradational pattern is seen. A clear change in Iithology occurs at the Eocene-Oligocene boundary, from a finegrained clay-dominated deposit below the boundary to a clay with silt and mica above. Near shore marine and fluvial sediments of Early Oligocene to mid Miocene age are known from the offshore and onshore areas, witnessing that the coastline migrated into the basin for the first time since the earliest Cretaceous. This change in sedimentation pattern was probably caused by the initial uplift of Scandinavia. At mid Miocene time a significant environmental change occurred in the North Sea. A change from dark coloured to light coloured deposits indicates introduction of a well-oxygenated environment. A marked increase in rate of sedimentation (and subsidence) is evidenced by the approx. 1500 m thick sedimentary package in the central part of the basin. Late Middle Miocene starved sedimentation seen in the central North Sea may indicate a significant increase in subsidence rates. The base of the Quaternary is a major erosional unconformity, mainly created by erosion caused by uplift of Scandinavia. 1000-1200 m of uplift is calculated for the eastern part of the North Sea Basin. With a post-Eocene subsidence of 2500 m in the central North Sea, the amplitude of the post-Eocene tectonic movements is approx. 3700 m.

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