Results 11 to 20 of about 455 (173)

Large Igneous Province Record Through Time and Implications for Secular Environmental Changes and Geological Time‐Scale Boundaries

open access: yesGeophysical Monograph Series, Page 1-26., 2021

Exploring the links between Large Igneous Provinces and dramatic environmental impact

An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Richard E. Ernst   +8 more
wiley  

+10 more sources

LATE DEVONIAN CONODONTS FROM THE HOJEDK SECTION, KERMAN PROVINCE, SOUTHEASTERN IRAN

open access: yesRivista Italiana di Paleontologia e Stratigrafia, 2008
Conodonts (34 species and subspecies) from the Hojedk section north of Kerman span the late Givetian to early Famennian. The new data suggest that Devonian biostromes in central and eastern Iran were deposited on differing levels, and that the currently ...
HOSSEIN GHOLAMALIAN   +1 more
doaj   +1 more source

The early gephuroceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)

open access: yesEuropean Journal of Taxonomy, 2022
The ammonoids of the suborder Gephuroceratina from the Roteisenstein (Red Ironstone) Formation of the area around Dillenburg (eastern Rhenish Mountains) are revised, mainly based on historical collections stored in the Museum für Naturkunde, Berlin. The
Dieter Korn, Jürgen Bockwinkel
doaj   +1 more source

Paleomagnetic studies of the Middle-Upper Devonian section of the Voronezh anteclise (Pavlov quarry) [PDF]

open access: yesНефтегазовая геология: Теория и практика, 2021
New paleomagnetic determinations are presented for a collection of rocks of the Middle-Upper Devonian (Givetian and Frasnian stages), sampled from an outcrop on the southwestern slope of the Pavlov granite quarry.
Iosifidi A.G., Popov V.V.
doaj  

Late Devonian (Frasnian–Famennian) palynomorphs from the Padeha and Bahram Formations of Shahzadeh Mohammad section, northwest of Kerman, Iran

open access: yesActa Palaeobotanica, 2022
A diverse and well-preserved microphytoplankton assemblage is reported from a measured section of Frasnian–Famennian (Upper Devonian) Padeha and Bahram Formations in Shahzadeh Mohammad area, northwestern Kerman, southeast Iran. The palynoflora assemblage
Roghayeh Rouzegar, Péter Ozsvárt
doaj   +1 more source

Palynology and geochemistry of the Frasnian global transgression in the Parnaíba Basin, Brazil [PDF]

open access: yesReview of Palaeobotany and Palynology, 2021
Abstract An integrated palynological and geochemical approach has been initiated to date and to precise the geochemical events of the Pimenteiras Formation, in the Late Devonian from the Parnaiba Basin, Brazil. Based on good biostratigraphic markers and presence of index species among miospores, acritarchs and chitinozoa, the investigated sequences ...
Steemans, Philippe   +7 more
openaire   +3 more sources

Stratigraphic distribution and systematic composition of the Middle-Upper Devonian placoderms (anti-archs) from Central Kazakhstan

open access: yesИзвестия высших учебных заведений: Геология и разведка, 2016
The stratigraphie distribution and systematic composition of the Middle-Upper Devonian remains of antiarchs from the sediments of Central Kazakhstan are analyzed. Central Kazakhstan ichthyofauna contains mainly endemic taxons of antiarchs.
S. V. Moloshnikov
doaj   +1 more source

Dolocretes in the Amata Formation of Latvia as indicators of climate aridification during the Givetian–Frasnian transition [PDF]

open access: yesEstonian Journal of Earth Sciences
This study focuses on the description and interpretation of the origin of dolocretes and their siliciclastic host rocks in the upper part of the Amata Formation (Fm) in four exposures in Latvia. The dolocretes occur in at least four intervals.
Ģirts Stinkulis   +4 more
doaj   +1 more source

The Late Devonian placoderm Aspidichthys Newberry, 1873 from the Holy Cross Mountains, Poland [PDF]

open access: yesFossil Record, 2016
The reported placoderm remains from the Holy Cross Mountains, Poland, belong to the species Aspidichthys ingens Koenen, 1883. This study focuses on the material described in the past from Wietrznia Quarry but the new specimens were also collected form ...
P. G. Dworczak, P. Szrek
doaj   +1 more source

Mercury Anomalies Link to Extensive Volcanism Across the Late Devonian Frasnian–Famennian Boundary in South China

open access: yesFrontiers in Earth Science, 2021
The Late Devonian Frasnian–Famennian (F–F) mass extinction has been long-time debated by non-volcanic causes, extra-terrestrial impacts, and large igneous province (LIP) eruptions.
Jiawei Zhang   +8 more
doaj   +1 more source

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