Results 171 to 180 of about 8,464 (208)

Sequence stratigraphy and architecture of a late Early–Middle Aptian carbonate platform succession from the western Maestrat Basin (Iberian Chain, Spain)

Sedimentary Geology, 2009
Abstract The attributes of a ‘four-systems-tract’ sequence are at times difficult to identify in outcrop-scale carbonate successions. Poor exposure conditions, variable rates of sediment production, erosion and/or superposition of surfaces that are intrinsic to the nature of carbonate systems frequently conceal or remove its physical features.
Telm Bover-Arnal, Ramon Salas, Josep A. Moreno-Bedmar, Klaus Bitzer   +3 more
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Fringing carbonate platforms at the Arabian Plate margin in northern Oman during the Late Aptian–Middle Albian: Evidence for high-amplitude sea-level changes

Sedimentary Geology, 2005
Abstract The Aptian–early Middle Albian margin of the Arabian Platform is exposed in Wadi al Assyi (northeast of Jebel Akhdar in northern Oman), and exhibits remarkable geometries testifying to the sedimentary history during the subaerial exposure of most of the Arabian Platform.
Gréselle, Benjamin, Pittet, Bernard
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Middle Aptian biostratigraphy and ammonoids of the Northern Caucasus and Transcaspia

Paleontological Journal, 2016
The Middle Aptian deposits of the central and eastern regions of the Northern Caucasus and Transcaspia (Turkmenistan) are described and discussed, including the history of their studies, lithology, and characterization of ammonite zones in each region. Ammonites of the superfamilies Parahoplitoidea and Douvilleiceratoidea, which form the basis for the ...
T. N. Bogdanova, I. A. Mikhailova
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New ancyloceratidae (Ammonoidea) from the Aptian of the Ulyanovsk region, Middle Volga

Paleontological Journal, 2014
A new genus Pseudoancyloceras gen. nov. with the type species P. calinovense sp. nov. and five new species of Ancyloceratidae (Australiceras (Proaustraliceras) elegans sp. nov., Audouliceras vyrystaykense sp. nov., A. brusyankense sp. nov., A. mordovense sp. nov., Tropaeum (Tropaeum) elaurkense sp.
I. M. Stenshin, I. A. Shumilkin, G. N. Uspensky   +2 more
openaire   +1 more source

Possible Insect Eggs in Palynological Preparations from the Aptian (Middle Cretaceous) of Brazil

Micropaleontology, 1986
A group of microfossils is described from Middle Cretaceous (Aptian) sediments of Brazil considered to have formed in a brackish-water, possibly deltaic environment. The microfossils have the form of oblate spheroids with reticulate surfaces interrupted by two bands of elongate fields and with a distinct, circular operculum; the name Mystheria ...
Marília da Silva Pares Regali, William A. S. Sarjeant, Marilia da Silva Pares Regali   +2 more
openaire   +1 more source

Orbital Chronology of the Lower–Middle Aptian: Palaeoenvironmental Implications (Serre Chaitieu Section, Vocontian Basin)

2014
A detailed cyclostratigraphic study conducted on several proxies including spectral gamma ray, magnetic susceptibility, clay minerals, and carbonate content suggests that the return to equilibrium in the carbon cycle after the major disturbance linked with Oceanic Anoxic Event 1a occurred in about 2 Myr. The minimum duration of the D.
Deconinck, Jean-François, Ghirardi, Julie, Martinez, Mathieu, Bruneau, Ludovic, Pucéat, Emmanuelle, Pellenard, Pierre   +5 more
openaire   +1 more source

Orbitally paced global oceanic deoxygenation decoupled from volcanic CO2 emission during the middle Cretaceous Oceanic Anoxic Event 1b (Aptian-Albian transition)

Geology, 2022
AbstractThe ongoing oceanic oxygen loss will have a profound impact on the distribution and density of life on Earth. However, drivers of the initiation and termination of global oceanic deoxygenation are poorly understood. Here we present a thallium isotope record that reveals three rapid (50 k.y.) global deoxygenation intervals during the mid ...
Wang, Yi, Bodin, Stéphane, Blusztajn, Jerzy S., Ullmann, Clemens, Nielsen, Sune G.   +4 more
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Taxonomy of limnic Ostracoda (Crustacea) from the Alagamar Formation, middle–upper Aptian, Potiguar Basin, northeastern Brazil

Journal of Paleontology, 2013
Fifteen limnic ostracodes species have been recorded in the Alagamar Formation, Potiguar Basin:Cypridea araripensisSilva, 1978a;Cypridea?sp.,Harbinia sinuata(Krömmelbein and Weber, 1971);Harbinia crepatan. sp.,Harbinia dimorphican. sp.,Harbinia altaAntonietto et al., 2012;Paracypria?elongatan.
Dermeval Aparecido Do Carmo, João Carlos Coimbra, Robin Charles Whatley, Lucas Silveira Antonietto, Raphael Teixeira De Paiva Citon   +4 more
openaire   +1 more source

Middle East Aptian rudist-foraminiferal-algal associations and their possible modern Arabian Gulf analogue

Geobios, 1998
Abstract The depositional history of the rudist-dominated facies of the Shu'aiba Formation of the Arabianpeninsula may be best understood by studying a possible analogue such as the Great Pearl Bank Barrier, located on the southern flanks of the Arabian Gulf.
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Facies Characteristics of Aptian Formation within the Regional Stratigraphic Framework of a Giant Carbonate Field in the Middle East

Abu Dhabi International Petroleum Conference and Exhibition, 2012
Abstract Facies and their distribution in space are key building blocks to determine the depositional architecture of hydrocarbon reservoirs. For this reason, the unified high resolution facies and sequence stratigraphy boundaries are needed to constrain facies architecture and their properties distribution for constructing the 3D static
Zinhom El Wazir, Noura Al Madani, Klaus Müller   +2 more
openaire   +1 more source