Wyniki wyszukiwania - Biblioteka Nauki

1

Early Eocene age of a sandstone from the Buntmergel Formation (Gresten Klippen Zone, Lower Austria)

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Gasiński M. A. , Hoeck V. , Ślączka A. , Ionescu C.

Geological Quarterly

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2012

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tom Vol. 56, No. 4

845--852

EN

The Gresten Klippen Zone is an individual geological unit, mainly outcropping at the northern rim of the Northern Calcareous Alps. It is best exposed between the Enns Valley in the west and the Vienna Forest in the east. It contains a rock sequence ranging from Early Jurassic to Early Cretaceous, including sandstones, various limestones, breccias and radiolarites. The late Early Cretaceous–Paleogene is represented by the Buntmergel Formation. A sandstone block from the latter yields well-preserved planktonic foraminiferids which allow an assignment to the Early Eocene (E-7 Zone). The low density currents which deposited the parallel laminated sandstones originated in the lower shelf-middle slope.

2

The utility of Deep-Water Agglutinated Foraminiferal acmes for correlating Eocene to Oligocene abyssal sediments in the North Atlantic and Western Tethys

100%

Kamiński M. A.

Studia Geologica Polonica

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2005

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tom Vol. 124

325-340

EN

Quantitative analysis of Deep-water Agglutinated Foraminifera (DWAF) assemblages from key ODP sites in the North Atlantic reveal the presence of stratigraphically-significant abundance maxima, that may be useful for correlating sedimentary sequences deposited beneath the CCD. The DWAF record from ODP Hole 647A in the Labrador Sea was re-studied and abundances were recalculated by excluding calcareous benthic foraminifera. This hole is a key locality, as it provides direct calibration of the DWAF biostratigraphy to the standard chronostratigraphy. Eight DWAF acmes are recognised in the Eocene to lower Oligocene at Site 647 and at other North Atlantic and Norwegian Sea sites. These are: The Paleocene-Eocene Thermal Maximum (PETM) Glomospira Acme, a lower Eocene N. excelsa acme, an early/middle Eocene Glomospira Acme, a Karrerulina acme, a middle Eocene Reticulophragmium amplectens acme, a middle/late Eocene Spiroplecta- mmina acme, a latest Eocene-early Oligocene Ammodiscus latus acme, and an early Oligocene Spirosigmoilinella acme. Some of these acmes can be correlated with similar events occurring at onshore localities in the Western Tethys (northern Spain, Moroccan Rif, Italian Appenines, Western Carpathians). The occurrence of these DWAF acmes is caused by variations in the trophic continuum which is a consequence of the profound climatic and oceanographic changes that took place in the deep ocean during the Eocene and early Oligocene.

3

Geochronology of selected andesitic lavas from the King George Bay area (SE King George Island)

88%

Pańczyk M. , Nawrocki J.

Geological Quarterly

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2011

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tom Vol. 55, No. 4

323-334

EN

Volcanic rocks from the Lions Rump area, which are the basement for a sequence of glaciomarine sediments of the Polonez Cove Formation, and lava flows from the Turret Point–Three Sisters Point area were sampled for thermogeochronological and palaeomagnetic investigations. Generally, andesitic lavas from King George Bay area consist mainly of clinopyroxene (Ti-augite) orthopyroxene (hyperstene) and plagioclase phenocrysts. The groundmass comprises mostly plagioclase laths, clinopyroxene, titanomagnetite and rare orthopyroxene crystals. However, the modal content, size, shape and distribution of phenocrysts are variable and specific for each sample. The Ar-Ar plateaus ages calculated for lavas from the Lions Rump area are very homogenous and point to middle Eocene age (Lutetian, ~44.5 Ma). The similar and consistent ages for volcanic basement for that area excluded the thesis about separate tectonic evolution of the Warszawa and Kraków blocks at least since the middle Eocene. The lavas from Turret Point and Three Sister Point are younger and were emplaced during the late Eocene (Bartonian/Priabonian: 37.3 š0.4 Ma and Priabonian: 35.35 š0.15 Ma, respectively). The results of isotopic investigations are consistent with magnetic polarities of the rocks indicating that the samples from the Lions Rump area are coeval with the lower part of the C20 polarity chron whereas the sample from Turret Point can be correlated with the upper part of the C17 polarity chron

4

Ichnological analysis of an Eocene mixed marly-siliciclastic flysch deposits in the Nienadowa Marl Member, Skole Unit, Polish Flysch Carpathians

88%

Rajchel J. , Uchman A.

Annales Societatis Geologorum Poloniae

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1998

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tom Vol. 68, No. 1

61-74

EN

The Nienadowa Marl Member, composed mainly of various marly, mixed siliciclastic-marly, or siliciclastic thin-bedded turbidites, is deeply burrowed by opportunistic Thalassinoides, Chondrites, Phycosiphon and Scolicia. Ichnofabrics and the trace fossil assemblage indicate well oxygenated environment. Relatively low ichnodiversity is probably related to opportunistic burrowers influenced by possible eutrophy and strong sediment heterogeneity, as well as to preservational potential. Ichnofabrics and trace-fossil tiering patterns are different in the basinal sections of the Nienadowa Marl Member and in the slope/shelf environment represented by marlstone clasts in the coeval debris-flow deposits of the Czudec Clay. Thalassinoides penetrates deeper than Chondrites in the proximal turbidites and shallower than Chondrites in the distal turbidites.

PL

Ogniwo margli z Nienadowej (og) złożone jest głównie z różnorodnych, marglistych, mieszanych silikoklastyczno-marglistych i silikoklastycznych, cienkoławicowych turbidytów. Utwory te są głęboko zbioturbowane i zawierają oportunistyczne skamieniałości śladowe: Thalassinoides, Chondrites, Phycosiphon i Scolicia. Ichnofabric i zespół skamieniałości śladowych wskazują na środowisko dobrze natlenione. Stosunkowo niskie zróżnicowanie ichnotaksonomiczne związane jest z oportunizmem infauny penetrującej w osadzie, przypuszczalnie powodowanym eutrofią, heterogenicznością składu petrograficznego osadu, oraz niskim potencjałem zachowania skamieniałości śladowych. Ichnofabric i skamieniałości śladowe różnią się między basenowymi facjami reprezentowanymi przez ogniwo margli z Nienadowej (og), a facjami skłonu i głębszego szelfu, obecnymi w klastach z równowiekowych osadów spływów kohezyjnych (iły z Czudca). Thalassinoides penetruje głębiej niż Chondrites w facjach proksymalnych turbidytów, a płycej niż Chondrites w turbidytach facji dystalnych.

5

First Cenozoic glaciers in West Antarctica

88%

Birkenmajer K. , Gaździcki A. , Krajewski K. P. , Przybycin A. , Solecki A. , Tatur A. , Yoon H. I. , Birkenmajer K. , Gaździcki A. , Krajewski K. P. , Przybycin A. , Solecki A. , Tatur A. , Yoon H. I.

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6

Eocene sedimentary facies in volcanogenic succession on King George Island, South Shetland Islands : a record of pre-ice sheet terrestrial environments in West Antarctica

88%

Mozer A.

Geological Quarterly

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2013

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tom Vol. 57, No. 3

385--394

EN

About 34 Ma ago there was a radical change of climate that led to the formation of Antarctic ice sheet. King George Island, located in the South Shetland Islands volcanic arc (northern Antarctic Peninsula region), is one of a few places in West Antarctica which shows a geological record of sedimentary environments preceding development of the ice sheet. The Eocene sedimentary facies occur in the dominantly volcanogenic succession of King George Island. They have been recognized in the Arctowski Cove and Point Thomas formations (Ezcurra Inlet Group) and in the Mount Wawel Formation (Point Hennequin Group) in Admiralty Bay, and in the Mazurek Point Formation (Chopin Ridge Group) and Lions Cove Formation (Polonia Glacier group) in King George Bay. They record a cooling trend in terrestrial environments that began at termination of the Early/Middle Eocene Climatic Optimum, and was followed by a significant deterioration of climate during Late Eocene and earliest Oligocene, directly preceding glacial conditions in the northern Antarctic Peninsula region. The ongoing research confirms the existence of three preglacial climatic stages (PGS-1 – PGS-3) during Eocene – earliest Oligocene, from humid, warm to moderate climate (PGS-1), through cool and dry climate (PGS-2), up to cold and humid conditions (PGS-3). Studies were carried out on usually fine-grained volcanoclastic sediments, containing Podocarpaceae–Araucaria–Nothofagus plant fossils assembly. Beds of reworked pyroclastic material alternate with lava flows or volcanic agglomerates, as well as ex situ blocks of Eocene volcanogenic sediments on a moraine. Calculated geochemical indices of weathering (CIA, PIA and CIW) confirm moderate to high chemical weathering under warm and humid climate conditions at the beginning and deterioration of conditions in the end of Eocene.

7

Eocene relatives of cod icefishes (Perciformes: Notothenioidei) from Seymour Island, Antarctica

88%

Bieńkowska-Wasiluk M. , Bonde N. , Møller P. R. , Gaździcki A.

Geological Quarterly

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2013

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tom Vol. 57, No. 4

567--582

EN

Fragmentary skull bones and vertebra from the Upper Eocene La Meseta Formation on Seymour (Marambio) Island, Antarctic Peninsula have been described as gadiform fishes, informally named “Mesetaichthys”. Here we describe jaws as Mesetaichthys jerzmanskae n. g. and n. sp., and refer this taxon to the perciform suborder Notothenioidei. This group is almost unknown as fossils. Similarities to the living, ‘primitive’ nototheniid Dissostichus eleginoides are indicated in the dentition. Gadiform evolution in the Paleocene-Eocene, and the possibility of a correlation between the origin and evolution of notothenioids in connection with the deterioration of the climate in Antarctica during the Late Eocene-Oligocene is discussed.

8

New fossil amphipod, Palaeogammarus polonicus sp.nov. from the Baltic amber

88%

Jażdżewski K. , Kulicka R.

Acta Geologica Polonica

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2002

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tom Vol. 52, nr 3

379-383

EN

A new species of the amphipod crustacean, Palaeogammarus polonicus sp. nov., is established upon one specimen embedded in a piece of Eocene Baltic amber. The new species is compared with four formerly described amphipods from Baltic amber, all belonging to the genus Palaeogammarus ZADDACH, 1864 (Crangonyctidae).

9

New trace fossils from the La Meseta Formation (Eocene) of Seymour Island, Antarctica

88%

Uchman A. , Gaździcki A. , Uchman A. , Gaździcki A.

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nr 2

10

Carpathian flysch sea in the Late Eocene-Early Oligocene: example of bottom-water oxygenation development

75%

Leszczyński S.

Biuletyn Państwowego Instytutu Geologicznego

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2001

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tom nr 396

95-96

11

The Siary zone of the Magura Nappe (Western Outer Carpathians) in the Late Eocene-Early Oligocene: sedimentation in front of an accretionary prism

75%

Leszczyński S.

Biuletyn Państwowego Instytutu Geologicznego

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2001

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tom nr 396

96-97

12

Foraminiferal stratigraphy of Palaeogene deep-water red facies in the Gorce Mountains (Magura Nappe, Polish Outer Carpathians)

75%

Bąk K. , Bąk M. , Cieśla M. , Paul Z.

Annales Societatis Geologorum Poloniae

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2013

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tom Vol. 83, No. 3

201--212

EN

The deposition of red and variegated mudstones and claystones characterized the ancient Tethys Ocean during Cretaceous and Palaeogene times, including in its north-western part, the Alpine–Carpathian deep-water basins. Palaeogene variegated sediments, containing red mudstone and claystone layers, crop out in the Gorce Mountains (Rosocha creek, near Lubomierz) in the Magura Nappe (Bystrica Subunit) of the Polish Outer Carpathians. These sediments occur as layers 1–10 cm thick and as packages of layers 2–3 m thick that are associated with very thin-bedded turbidites. The entire succession is tectonically disturbed and parts of it belong to the Ropianka, Łabowa Shale and Beloveža Formations. The sediments studied contain 27 genera and 59 species that belong to deep-water agglutinated foraminiferal (DWAF) assemblages. Tubular taxa, which are frequent in various Mesozoic–Cenozoic flysch sediments are relatively rare in the section studied. The assemblages are moderately diverse (3–20 taxa per sample). Excluding tubular forms, the most common taxa belong to Trochamminoides – Paratrochamminoides spp., Saccammina placenta, glomospirids, Recurvoides – Recurvoidella spp. and karrerulinids. The oldest part of the red sediments, referable to the Ropianka Formation, represents the upper part of the Rzehakina fissistomata Zone (probably the Upper Palaeocene). The youngest red sediments, forming thin intercalations in the Beloveža Formation, represent the acme of Reticulophragmium amplectens (middle Lutetian). Owing to tectonic disturbances, most of the Lower Eocene part of the variegated facies of the Łabowa Shale Formation is not preserved in the section studied. The upper part of it, a package 2 m thick, represents the lower part of the Reticulophragmium amplectens Zone. The small thickness (10–15 m) of the Łabowa Shale Formation in the section studied is similar to other sections in the southern part of the Bystrica Subunit. It is probably of a sedimentary nature, reflecting a decreasing number of mud-rich, gravitational flows in the southern part of the Magura Basin during the Early Eocene. Nevertheless, the strong tectonic disturbances that took place in this area during the Oligocene–Miocene folding and overthrusting influenced the reduction in thickness of these sediments.

13

Homotryblium-dominated Eocene dinoflagellate cyst assemblages from Middle Miocene (Badenian) glauconitic sands at Lipowiec (Roztocze, SE Poland)

75%

Gedl P.

Geological Quarterly

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2016

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tom Vol. 60, No. 2

461--472

EN

A section over 20 m thick of the basal Middle Miocene succession exposed at Lipowiec (Roztocze, SE Poland) was studied for palynology. Thirteen samples were collected from quartz and glauconitic-quartz sands and thin clay layers. Sand samples were barren but clay samples yielded dinoflagellate cysts. Their assemblages consist of reworked Paleogene specimens dominated by the Homotryblium floripes complex (H. floripes and morphologically similar H. plectilum and H. vallum). The presence of reworked Paleogene specimens indicates intense erosion of marine Paleogene strata during initial stages of the Middle Miocene transgression at Roztocze. Analysis of stratigraphical ranges of reworked dinoflagellate cysts and comparison with their occurrences in known epicontinental Paleogene sites of SE Poland suggest an Upper Eocene age of the washed-out strata. The taxonomic composition of the assemblages described suggests that the Upper Eocene deposits accumulated in a near-shore, lagoonal embayment characterized presumably by oligotrophic waters of slightly increased salinity. A high proportion of the Homotryblium floripes complex is also characteristic of reworked assemblages found in younger Miocene strata of neighbouring exposures in Roztocze, which indicates widespread Eocene lagoonal environments in this part of Roztocze. Coeval Eocene strata from the eastern part of Roztocze and from the Carpathian Foredeep show different taxonomic compositions suggesting varied sedimentary settings during Eocene transgression in this region. These differences reflect variable amounts of freshwater influence resulting in a range of environments that ranged from oligotrophic to brackish.

14

The Eocene Hieroglyphic beds and Green shales in the Rożnów Lake area (Silesian Nappe, Outer Carpathians) - facies development and biostratigraphy

75%

Waśkowska A.

Geology, Geophysics and Environment

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2014

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tom Vol. 40, no. 1

5--26

EN

In the lithostratigraphic section of a sedimentary sequence of the Silesian Nappe in the area of Rożnów Lake, the strata that occur above the Ciężkowice sandstone and below the Globigerina marls are represented by a relatively thin unit informally named the Hieroglyphic beds and a succeeding thick complex of so-called Green shales. The Hieroglyphic beds, deposited over a short time interval during the Lutetian time (Reticulophragmium amplectens zone), are followed by the Green shales that were deposited from the Lutetian to the Priabonian (Reticulophrgamium amplectens, Ammodisus latus, Reticulophragmium rotundidorstum zones). This work describes the foraminiferal assemblages, on the basis of which, the age of the Green shales was established that in the area of Rożnów Lake. Deposition of the Green shale unit started in the Lutetian, while in other regions of the Silesian Basin it is documented from the Priabonian. The upper boundary of the Green shales is isochronous and defined by the base of the calcareous horizon of a specific type of marls known as the Globigerina marls.

15

Radiolarian and agglutinated foraminiferal biostratigraphy of the Paleogene deep-water deposits on the northern margin of the Carpathian Tethys (Skole Unit)

75%

Rajchel J. M. , Barwicz-Piskorz W.

Geological Quarterly

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2012

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tom Vol. 56, No 1

1-24

EN

Radiolarian and agglutinated foraminiferal fauna within upper deposits of the Skole Unit of the Polish Flysch Outer Carpathians occur in the Variegated Shale and Hieroglyphic formations of Paleocene and Eocene age. About 70 radiolarian and 50 foraminiferal species have been identified and their stratigraphic distribution determined using both regional and local biozonations. Five radiolarian zones: the Bekoma bidartensis Interval Zone, the Buryella clinata Interval Zone, the Phormocyrtis striata striata Interval Zone, the Theocotyle cryptocephala Interval Zone and the Dictyoprora mongolfieri Interval Zone in the lower Eocene and in the lower part of the middle Eocene have been distinguished. In the upper part of the middle Eocene and in the uper Eocene the abundance of radiolarians decreases and their age assignment has not been possible. Five foraminiferal zones have been distinguished and correlated with radiolarian zones based on co-occurrence of both Protista groups in the deposits investigated. These are: the Rzehakina fissistomata Zone, the Saccamminoides carpathicus Zone, the Reticulophragmium amplectens Zone, the Ammodiscus latus Zone and the Cyclammina rotundidorsata Zone covering the time span from upper Paleocene to upper Eocene.

16

The facies and biota of the oldest exposed strata of the Eocene La Meseta Formation (Seymour Island, Antarctica)

75%

Tatur A. E. , Krajewski K. P. , lvalle de R. A.

Geological Quarterly

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2011

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tom Vol. 55, No. 4

345-360

EN

La Meseta Formation is made up of estuarine and shallow marine, fossiliferous clastic deposits 720 m thick that provides a unique record of marine and terrestrial biota of Antarctic ecosystems preceding continental glaciation in the Oligocene. The lower limit of this formation has been poorly known, and therefore it has been carefully investigated. The lowest part of the La Meseta Formation, at the southern bank of a palaeodelta, is represented by relics of a prograding sequence of sediments deposited in the wave-dominated part of a deltaic system in the offshore and lower and upper shoreface environments. The sequence is completed landwards by younger tidal plain sediments deposited at 40 m lower altitude in a relatively protected, central estuarine basin, which was dominated by tidal activity and influenced by periodic fluvial inflow. These strata were deposited during a late Paleocene or Ypresian/Lutetian lowstand of sea level, which might reflect a glaciation event or glacioisostatic rebound of land following deglaciation of hypothetic Antarctic inland glaciers. Forced regression of sea level and seaward expansion of a deltaic freshwater environment, led to local extinction of a unique assemblage of marine echinoderms, bryozoans, corals and brachiopods. These marine fossils, representing a thanatocoenosis, are perfectly preserved due to syngenetic goethite permineralisation. This process owed its origin to excess reactive iron coming from sulphide-rich bedrock through weathering processes and acid sulphate drainage of the neighbouring land area.

17

Dinoflagellate cysts from the Palaeogene of the Łukowa-4 borehole (Carpathian Foredeep, SE Poland) : biostratigraphy and palaeoenvironment

75%

Gedl P.

Annales Societatis Geologorum Poloniae

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2015

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tom Vol. 85, No. 1

285--308

EN

This paper documents the presence of Eocene marine strata in the Carpathian Foredeep area in Poland. Assemblages of marine dinoflagellate cysts have been found in sands penetrated by the Łukowa-4 borehole below the Miocene succession of the foredeep. Their age is interpreted as Late Eocene. The presence of marine strata of this age in this area sheds new light on the palaeogeography of the Carpathian foreland during the Late Eocene. The dinoflagellate cysts described are compared with coeval Carpathian and epicontinental assemblages; possible connections between these two basins are discussed. Phytogenetic deposits that occur above the marine sands of the Łukowa-4 borehole contain freshwater palynomorphs, indicating their swamp and lacustrine origins. The overlying sand contains impoverished dinoflagellate cyst assemblages; their age is discussed.

18

A second camel spider (Arachnida: Solifugae) from Baltic amber

75%

Dunlop J. , Klann A.

Acta Geologica Polonica

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2009

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tom Vol. 59, no. 1

39-44

EN

Fossil camel spiders (Arachnida: Solifugae) are extremely rare and only the second example ever recovered from Baltic amber (Paleogene: Eocene) is described here.Although superficially well preserved and more than twice the size of the previously known Baltic amber specimen, key taxonomic characters allowing meaningful comparisons to the other fossil and living material cannot, unfortunately, be resolved. It is formally treated here as Solifugae gen. et sp. indet., although we concede that it could be an adult of the previously recorded Baltic amber species Palaeoblossia groehni Dunlop,Wunderlich and Poinar, 2004.

19

First Cenozoic glaciers in West Antarctica

75%

Birkenmajer K. , Gazdzicki A. , Krajewski K. P. , Przybycin A. , Solecki A. , Tatur A. , Yoon H. I.

Polish Polar Research

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2005

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tom 26

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nr 1

3-12

EN

One of the most significant global climatic events in the Cenozoic was the transition from greenhouse to icehouse conditions in Antarctica. Tectonic evolution of the region and gradual cooling at the end of Eocene led to the first appearance of ice sheets at the Eocene/Oligocene boundary (ca. 34 Ma). Here we report geological record of mountain glaciers that preceded major ice sheet formation in Antarctica. A terrestrial- valley-type tillite up to 65 metres thick was revealed between two basaltic lava sequences in the Eocene- Oligocene Point Thomas Formation at Hervé Cove - Breccia Crag in Admiralty Bay- King George Island- South Shetland Islands. K-Ar dating of the lavas suggests the age of the glaciation at 45-41 Ma (Middle Eocene). It is the oldest Cenozoic record of alpine glaciers in West Antarctica- providing insight into the onset of glaciation of the Antarctic Peninsula and South Shetland Islands.

20

Palaeoclimatic implications across the Eocene-Oligocene transition in the Central Carpathian Palaeogene Basin: demise of carbonate platform and cool-water influx

75%

Sotak J. , Starek D. , Banska M. , Biron A. , Kotulova J.

Biuletyn Państwowego Instytutu Geologicznego

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2001

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tom nr 396

142-143