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(Bars have different values.) 1, 2 – Lenticulina sp., sample 4/03; 3 – Astacolus sp., sample 7/03; 4 – Guembelitria sp., sample8/03; 5 – Bulimina sp. (internal mould), sample 8/03; 6 – Pullenia sp., sample 18a/03; 7 – Ramulina sp., sample 7/03; 8 – Heterohelix striata (Ehrenberg), sample 8/03; 9 – Morozovella aequa ( Cushman & Renz), sample 18a/03; 10 – Morozovella sp., sample 17a/03; 11 – Subbotina triloculinoides (Plummer), sample 18a/03; 12, 13 – Subbotina cf. triloculinoides (Plummer), sample 18a/03; 14 – Rotalipora cf. appenninica (Renz), sample 14a/03; 15 – Globotruncana ex gr. lapparenti (Brotzen), sample 14a/03.
Source publication
The clasts of Cretaceous marls in the conglomerates of the Konradsheim Formation (Pöchlau quarry, Gresten Klippen Zone, Austria)
Investigations were carried out on foraminiferids and radiolaria from redeposited clasts within the conglomerates of the Konradsheim Formation (Gresten Klippen Zone) in the area of the Pöchlau hill, east of Maria Neustift...
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The thermal history of sedimentary basins is a key factor for hydrocarbon accumulation and resource assessment, and is critical in the exploration of lithospheric tectono-thermal evolution. In this paper, the Cenozoic thermal histories of nearly 200 wells and the Mesozoic thermal histories of 15 wells are modeled based on the vitrinite reflectance...
A preliminary documentation of the coral reefs from Libya
International Conference on Geology
June 22-23, 2015 Florida, USA
Belkasim Khameiss1, William Hoyt, Saad K El Ebaidi, Ahmed Muftah, James Klaus and Ann Budd4
Posters-Accepted Abstracts: J Geol Geosci
DOI: 10.4172/2329-6755.S1.003
Abstract
Corals studies in Libya are very limited, although...
El área Pampa Lirima-Cancosa, ubicada entre los paralelos 19°30’ y 20° S y entre el meridiano 69° O y la frontera con Bolivia, abarca una superficie de 2.465 km2 en la alta cordillera de la Región de Tarapacá. Su relieve se caracteriza por una topografía relativamente suave a una altura de ~4.100 m s.n.m. con cordones plegados de dirección norte-su...
Citations
... On the other side, this taxon is also recorded within Albian to Cenomanian deposits in the Atlantic domain, California and Pacific realms (Palechek et al., 2010;Kariminia, 2006;Thurow, 1988). Slaczka et al. (2009) described an assemblage containing Angulobracchia portmanni Baumgartner, Dictyomitra communis (Squinabol), Hiscocapsa asseni (Tan), Pseudodictyomitra lodogaensis Pessagno, Pseudoeucyrtis hanni (Tan), almost similar to GA7 taxa. These authors attributed the assemblage to Costata Zone that is confined to U.A.6-9 biochronozones of Midlle to Late Aptian age (O'Dogherty, 1994). ...
The lower part of Fandene Formation outcropping in northeastern Tunisia is represented by pelagic sequences and characterized by an important siliciclastic fraction that includes radiolarian and organic-rich beds of Allam Member. Litho-biostratigraphic analysis based on planktic foraminifera and radiolaria shows that deposition of organic-rich beds of Allam Member is confined to the Microhedbergella rischi Zone through the lower part of Tichzella primula Zone. Age diagnostic radiolaria recovered from these beds has been identified to constrain a direct age of black shale deposition. The assemblages can be correlated with the radiolarian biochronozone U.A.10-11 indicating an Early Albian to early Middle Albian in age. Radiolarian assemblages composed of species characteristic of U.A.10 biochronozone (A. montisserei, D. gracilis) are associated with radiolarian taxa belonging to Costata Zone (U.A.9 Pseudoeucyrtis hanni and Thanarla pseudodecora), which can be correlated with Dercourt Member in the Ionian Zone and Paquier level of the Vocontian Basin (southeast of France). Biostratigraphic and abundance curves analysis has demonstrated significant diversification of cryptocephalic Nassellaria and Archaeodictyomitrae, probably adapted to eutrophic conditions that characterized the Aptian-Albian transition. Ecological conditions may have governed the stratigraphic range of many cosmopolitan taxa (i.e., Pseudodictyoznitrae lodogaensis) compared with stratigraphic distributions schemes reported from other domains. The timing of black shales deposition was diachronic due to local geodynamic conditions and upwelling currents distribution. The Allam black shales are correlative with the oceanic anoxic event OAE1b which is characterized by the widespread of supraregionnally organic-rich beds in the Mediterranean Tethys basins across the Aptian-Albian transition.
... Continuous rock record of the Jurassic/Cretaceous boundary was recently documented by several authors in the northern (AlpineeCarpathian part) Mediterranean Tethys (Michalík et al., 2009;Lukeneder et al., 2010;Michalík and Reháková, 2011). On the other hand, some sections (including also large exposures in the Butkov Quarry presented here) bear signs of interrupted sedimentation, gaps and submarine erosion (Slą czka et al., 2009;Grabowski et al., 2010, etc.). This lack was mostly not caused by emersion on the J/K boundary, but by extensive bottom denivelation due to tectonic stress and by submarine erosion of older strata during Late Berriasian sea level drop (Be-7; cf. ...
The base of Lower Cretaceous sequence in the Manín Unit is erosive but without signs of subaerial emersion. Submarine erosion was triggered by bottom denivelization during Late Berriasian extension of the area. Sedimentation of planktogenic hemipelagic limestones started during latest Berriasian/earliest Valanginian and continued until Aptian.The presence of late Valanginian anoxic oceanic event was not confirmed with certainty in the Butkov sections. A δ13C event in the Campylotoxus Zone inside the Ladce Fm pale limestone sequence indicates the expected global perturbation of the carbon cycle. The absence of any black shale record documents local oxic conditions in marginal part of the basin. Sedimentation of dark limestones of the overlying Mráznica Formation was associated rather with climate instability, general slight cooling and with fine terrigeneous input from dryland into basin.Isotope C curves indicate decreasing trend of δ13C values from +2.5‰ to +1.5‰ PDB. Relatively highest values (2.5 to 2.6‰) were reached during Oblongata- nannofossil- and/or the Calpionellites calpionellid zones. As neither black shales, nor the main phase of the warming event limited by the Campylotoxus – Verucosum ammonite zones were recorded, the C – isotope excursion is interpreted as an effect of local changes.Colonization of soft bottom by epibenthic organisms was gradual and long-lasting. Benthic islands of epifauna formed around hard objects on muddy bottom (ammonite shells, etc.). Trend of increasing calcification of benthic organisms resulted in carbonate platform progradation (connected with submarine sliding, redeposition and carbonate clastic accumulation on toe of the slope). The carbonate platform covered the area until Late Aptian. Carbonate platform growth was stopped and the platform collapsed during middle Albian. Hard rock surface bored by infaunal organisms has been buried under thick sequence of pelagic marls.
Two sections of the klippen zones in the Wienerwald area have been investigated for their stratigraphy: (1) The Gern section of the Main Klippen Zone, a part of the Gresten Klippen Zone, and (2) the St. Veit Klippen Zone in the Lainz Tunnel and
the neighboring outcrops in western Vienna. New biostratigraphic data are based on radiolaria from siliceous intervals and a few findings of calcareous nannofossils from marlstones. In the Gresten Klippen Zone, radiolarian assemblages from
limestones of the Gern locality indicate a middle Oxfordian to early Kimmeridgian age of the Scheibbsbach Formation. Radiolarian and nannofossil data from the St. Veit Klippen Zone in the Lainz railway tunnel locality, as well as correlated
outcrops from the Lainzer Tiergarten and the Gemeindeberg in the southwest of Vienna, indicate the presence of mainly Bajocian to lower Oxfordian red radiolarites and cherts (Rotenberg Formation). Siliceous, grey limestones and cherts of the
Fasselgraben Formation range from the upper Oxfordian–Kimmeridgian to the Valanginian–Barremian. The Main Klippen Zone was derived from the European margin to the north, and this zone is regarded as a Helvetic paleogeographic unit. The St. Veit Klippen Zone in the Lainz Tunnel section contains no ophiolitic material and shows a tectonic contact with the surrounding Rhenodanubian nappe system, which indicates no primary sedimentary contact of the St. Veit Klippen Zone with the Flysch units, as well as demonstrating the presence of two structurally separated Alpine tectonic units. Thus, a direct correlation with the Ybbsitz Zone is not supported, and an original paleogeographic position in the transition from the Penninic Ocean to the Austroalpine continental fragment is proposed.
This are the explanatory notes to the geological map Grossraming in Upper Austria. The map comprises Mesozoic, Cenozoic and Quaternary deposits at the northern rim of the Eastern Alps.
Our work on the dark pelitic sediments of the Polish Carpathians and eastern Alps shows that these Jurassic through Lower Cretaceous sediments owe their organic content to a combination
of global processes, such as climatic changes and changes to the carbonate compensation depth (CCD), and local controls, such as basin morphology, input of terrestrial organic material, and local
volcanic activity. These sediments developed in basins both floored by oceanic crust as well as within the continental crust (North European platform). Our data show that these anoxic or poorly
oxygenated deposits (average total organic carbon [TOC] value is around 2.5 wt. %) were laid down in the individual basins at different times, from the Late Jurassic to the Barremian and almost continuously up to the early Cenomanian, a period of 30 to 50 m.y., and their thickness reached hundreds of meters. This long time span made it impossible to distinguish precisely the known
Aptian and Albian oceanic anoxic events (OAE). Our data show that sedimentation of dark organic-rich deposits was not only controlled by global events such as climatic and CCD changes, but also
by local ones as a result of differences in their basin morphology and development, input of land-plant detritus, and local volcanic activity. As an example of the anoxic succession, a detailed description of the black sediments of the proto-Silesian basin is presented. Some of these anoxic shales were buried to a depth of a few thousand meters during the folding and overthrusting movements. We propose that these shales could represent a unique shale-oil and shale-gas resource in an intensely structured basin.
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.
