Results 11 to 20 of about 7,617 (206)
Climate variability and ocean fertility during the Aptian Stage [PDF]
Climate of the Past, 2015 Several studies have been conducted to reconstruct temperature variations across the Aptian Stage, particularly during early Aptian Oceanic Anoxic Event (OAE) 1a.
C. Bottini +5 more
doaj +3 more sources
The Aptian Stage: Back to fundamentals
Episodes, 2011 The original definitions of the Aptian, Albian and Urgonian stages by d'Orbigny (1840, 1842, 1847, respectively) on the basis of lithological and paleonto- logical criteria were sufficiently clear and should not have generated the misinterpretations and confusion that began at the end of the 19th century and continue today. The purpose of this paper is
Moullade, Michel +2 more
core +5 more sources
Upper Aptian calcareous algae from Padurea Craiului (Northern Apuseni mountains, Romania)
Geologia Croatica, 2008 A study of calcareous strata previously assigned to the Barremian-Early Aptian interval in the northwestern part of P?durea Craiului, (Apuseni Mountains), led to the identification of a micropaleontological association indicative of a Late Aptian age ...
Ioan I. Bucur +2 more
doaj +2 more sources
Carnets de Géologie, 2006 A stratonomic and micropaleontological analysis of the Aptian marls cropping out in the La Tuilière area near Saint-Saturnin-lès-Apt (Vaucluse, SE France), enabled us to reconstitute a continuous succession almost 120 m thick, that includes the upper ...
Moullade Michel +3 more
doaj +1 more source
Lead isotopic record of Barremian–Aptian marine sediments: Implications for large igneous provinces and the Aptian climatic crisis [PDF]
Earth and Planetary Science Letters, 2011 We present initial isotopic ratios of lead for Early Cretaceous (Barremian–Aptian) sections from Shatsky Rise (Pacific) and Gorgo a Cerbara (Italy). Our Pb isotopic data track an interval representing Oceanic Anoxic Event (OAE)-1a, which is characterized by quasi-global deposition of organic carbon-rich black shale.
J. Kuroda +9 more
openaire +4 more sources
Substantiation of the Barremian/Aptian boundary
, 1999 This paper focuses on the Barremian/Aptian boundary in the Trans-Caspian area. Results of a stratigraphical study of the uppermost Barremian and the lower Aptian succession in the Trans-Caspian area are presented. The bed-by-bed description of three sections — Keldzhe, Tekedzhik and Utuludzha — is given as well as detailed lithologic columns.
Bogdanova, T.N., Prozorovsky, V.A.
openaire +2 more sources
THE APTIAN STRATIGRAPHY OF SOUTHERN TUARKYR (NW TURKMENISTAN, CENTRAL ASIA) [PDF]
Rivista Italiana di Paleontologia e Stratigrafia, 1999 The ammonite successions of Turkmenistan, particularly those of the Greater Balkhan and Tuarkyr areas, are considered references for the Aptian Stage. Six sections across the uppermost Barremian - basal Upper Aptian interval were studied in the Tuarkyr ...
FABRIZIO CECCA +2 more
doaj +2 more sources
Barremian–early Aptian charophyte biostratigraphy revisited [PDF]
Newsletters on Stratigraphy, 2022 New Barremian-early Aptian charophyte biozonations are proposed here based on the charophyte succession in the Maestrat Basin (Iberian Chain, Spain). Biostratigraphic analysis distinguished two biozonations, European and Eurasian, which were compared to establish correlations.
Pérez Cano, Jordi +2 more
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Palynology of Early Cretaceous (Barremian to Aptian) hydrocarbon (methane) seep carbonates and associated mudstones, Wollaston Forland, Northeast Greenland [PDF]
, 2022 Palynostratigraphic and palynofacies analysis have been performed on hydrocarbon seep carbonate, carbonate nodule and mudstone samples from the Early Cretaceous Kuhnpasset Beds in the Kuhnpasset area of Wollaston Forland, Northeast Greenland.
Morten Smelror +11 more
core +1 more source
The Gargasian (Middle Aptian) substage in the Aptian historical stratotypes (SE France): General introduction [PDF]
Carnets de géologie (Notebooks on geology), 2004 no ...
MOULLADE, Michel, TRONCHETTI, Guy
openaire +9 more sources