Results 91 to 100 of about 39,712 (281)

UPPER FRASNIAN (UPPER DEVONIAN) POLYGNATHUS AND ICRIODUS CONODONTS FROM THE BAHRAM FORMATION, HUR SECTION, KERMAN PROVINCE, SOUTHEASTERN IRAN

open access: yesRivista Italiana di Paleontologia e Stratigrafia, 2012
Conodont fauna from the Upper Devonian (Frasnian) Bahram Formation at the Hur section, north of Kerman, southeast Iran, is dominated by species of Icriodus and Polygnathus. This fauna allowed discrimination of two biointervals from the Lower rhenana Zone
TAYEBEH AHMADI   +2 more
doaj   +1 more source

Nueva información palinológica sobre la Formación Poti (Viseano superior) en el arroyo Roncador, Cuenca Parnaíba, noreste de Brasil [PDF]

open access: yes, 2014
Se presenta el resultado del análisis palinológico de seis muestras de superficie de la Formación Poti expuesta en el arroyo Roncador (Jerumenha, Piauí), noreste de Brasil.
Di Pasquo Lartigue, Maria, Iannuzzi, R.
core   +1 more source

Lower Wenlock black shales in the northern Holy Cross Mountains, Poland: Sedimentary and geochemical controls on the Ireviken Event in a deep marine setting [PDF]

open access: yes, 2016
The stratigraphic variability and geochemistry of Llandovery/Wenlock (L/W) Series boundary sediments in Poland reveals that hemipelagic sedimentation under an anoxic/euxinic water column was interrupted by low density bottom currents or detached diluted ...
Bond, David P. G.   +3 more
core   +1 more source

Hornblendite in the Lower Crust: A Possible Source for Porphyry Cu Deposits

open access: yesGeochemistry, Geophysics, Geosystems, Volume 27, Issue 5, May 2026.
Abstract Lower crustal sulfide‐bearing Cu‐rich cumulates, mainly occurring as hornblendite, have been proposed as a critical source component for the development of giant porphyry Cu deposits (PCDs); however, their mineralogical and geochemical nature remain elusive.
Guangxu Li   +5 more
wiley   +1 more source

Ofiuroideos del Cretácico Inferior de Patagonia: primer registro fósil articulado para el Mesozoico de América del Sur [PDF]

open access: yes, 2019
The first articulated remains of ophiuroids for the Mesozoic of South America are described from the Lower Cretaceous of Neuquén Basin, Argentina.
Comerio, Marcos   +6 more
core   +2 more sources

Revealing Permafrost Continuity Across a Northern Watershed With Airborne Electromagnetics

open access: yesJournal of Geophysical Research: Earth Surface, Volume 131, Issue 5, May 2026.
Abstract Permafrost thawing in northern regions may alter groundwater‐surface water dynamics, thereby impacting hydrologic and ecologic functions and the potential release of stored solutes including carbon. Here, we present an airborne frequency‐domain electromagnetic survey over a discontinuous permafrost region within the Central Mackenzie Valley in
O. Conway‐White   +3 more
wiley   +1 more source

Optimization of Parsimonious and Synchronized Discharge and Dissolved Organic Carbon Models Across Catchment Scales

open access: yesWater Resources Research, Volume 62, Issue 5, May 2026.
Abstract The production, transport, loss, and export of dissolved organic carbon (DOC) are closely connected with hydrometeorological drivers. While terrestrial production depends on biogeochemical variables like soil moisture, air temperature, and the contact area between water and organic matter sources, export is determined by water availability and
Juan Pesántez   +7 more
wiley   +1 more source

Some notes on a variability of Bothriolepidids (Placodermi, Antiarchi): unusual specimen of Livnolepis Heckeri (Luksevics) from the famennian of Tver region, European Russia

open access: yesИзвестия высших учебных заведений: Геология и разведка, 2019
The fragment of the skull cap of placoderm Livnolepis heckeri (Luksevics) from the Bilovo Formation (Famennian, Upper Devonian) near the Bilovo Village of Tver Region has been described.
S. V. Moloshnikov, V. V. Linkevich
doaj   +1 more source

Earth-atmosphere evolution based on the new determination of Devonian atmosphere Ar isotopic composition [PDF]

open access: yes
The isotopic composition of the noble gases, in particular Ar, in samples of ancient atmosphere trapped in rocks and minerals provides the strongest constraints on the timing and rate of Earth atmosphere formation by degassing of the Earth's interior. We
Gandanger, Pierre   +3 more
core   +1 more source

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