Results 21 to 30 of about 6,971 (210)

Palaeoclimatic oscillations in the Pliensbachian (Early Jurassic) of the Asturian Basin (Northern Spain) [PDF]

open access: yesClimate of the Past, 2016
One of the main controversial themes in palaeoclimatology involves elucidating whether climate during the Jurassic was warmer than the present day and if it was the same over Pangaea, with no major latitudinal gradients.
J. J. Gómez   +2 more
doaj   +1 more source

Toarcian oceanic anoxic event: An assessment of global causes using belemnite C isotope records [PDF]

open access: yes, 2005
Two hypotheses have been proposed to explain simultaneous large negative excursions (up to 7% PeeDee belemnite) in bulk carbonate (delta(13)C(carb)) and organic carbon isotope records (delta(13)C(org)) from black shales marking the Toarcian oceanic ...
Bailey, TR   +5 more
core   +1 more source

OSTRACODS FROM THE GLOBAL STRATOTYPE SECTION FOR THE BASE OF THE AALENIAN STAGE, JURASSIC AT FUENTELSAZ SECTION(CORDILLERA IBÉRICA, SPAIN)

open access: yesRivista Italiana di Paleontologia e Stratigrafia, 2009
The Toarcian/Aalenian Global Stratotype Section and Point (GSSP) have been recently placed in the Fuentelsaz section, northeastern Spain. This paper is part of a long-term project that attempts to describe for the first time the fossil ostracod ...
CARMEN ARIAS   +3 more
doaj   +1 more source

Biostratigraphic boundaries of Jurassic ages [PDF]

open access: yesНефтегазовая геология: Теория и практика, 2020
From the perspective of geobiospheric history, the boundaries of the Jurassic age are considered. Eusto-migratory zoopeneplen are associated with a number of global geobiospheric events, such as mass extinctions, geochemical anomalies, and ocean anoxic ...
Repin Yu.S.
doaj   +1 more source

Seawater redox variations during the deposition of the Kimmeridge Clay Formation, United Kingdom (Upper Jurassic): evidence from molybdenum isotopes and trace metal ratios [PDF]

open access: yes, 2010
The Kimmeridge Clay Formation (KCF) and its equivalents worldwide represent one of the most prolonged periods of organic carbon accumulation of the Mesozoic.
Abbink   +81 more
core   +1 more source

Micromorphs: Response of the Ammonite Fauna during the Toarcian Oceanic Anoxic Event (T-OAE) in the Es-Saffeh Mountains (Tiaret, Western Algeria)

open access: yesProceedings, 2022
The paleontological analysis of the fauna of ammonites collected in the marl–limestone series of the Pliensbachian and The Toarcian of the Es-Saffeh Mountains (Tiaret, western Algeria) brings new data to the Oceanic Anoxic Event of the lower Toarcian (T ...
Fatiha Douas Bengoudira   +2 more
doaj   +1 more source

A well-preserved specimen of Stenopterygius quadriscissus (Reptilia, Ichthyosauria) from the Early Jurassic (Toarcian) of Yorkshire, UK and new insights into species delineation in the genus [PDF]

open access: yesFossil Record
Despite abundant and productive Toarcian ichthyosaur-bearing localities in continental Europe, in the UK, Toarcian ichthyosaurs may often be fragmentary and/or too poorly preserved for positive identification.
Timothée Biot   +3 more
doaj   +3 more sources

First record of Gyrosteus mirabilis (Actinopterygii, Chondrosteidae) from the Toarcian (Lower Jurassic) of the Baltic region [PDF]

open access: yesPeerJ, 2020
An isolated hyomandibula from a lower Toarcian carbonate concretion of the Ahrensburg erratics assemblage (Schleswig-Holstein, northern Germany) represents the first record of a chondrosteid fish from the Lower Jurassic of the southwestern Baltic realm ...
Jahn J. Hornung, Sven Sachs
doaj   +2 more sources

Geology and Jurassic paleogeography of the Mt. Primo-Mt. Castel Santa Maria ridge and neighbouring areas (Northern Apennines, Italy) [PDF]

open access: yes, 2014
This paper presents the results of a geological mapping project across the Mt. Primo ridge and neighbouring areas (Umbria-Marche Domain – Northern Apennines), where a thick Meso-Cenozoic carbonate succession is exposed.
Fabbi, Simone
core   +2 more sources

Development of freeze-thaw processing technique for disaggregation of indurated mudrocks and enhanced recovery of calcareous microfossils [PDF]

open access: yes, 2014
Microfossil extraction from indurated mudrocks is widely acknowledged as challenging, especially for foraminifera. Here we report development of the freeze–thaw extraction method through the addition of rapid heating, detergent and ultrasound stages.
Coe, Angela L., Kennedy, Alice E.
core   +1 more source

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