Results 51 to 60 of about 8,490 (221)

Tracking the record of early life

Carnets de Géologie, 2005
Life may have been present on Earth from about 3.8 Ga or earlier. Based on a combination of geochemical, morphological and sedimentological evidence, the early biosphere included a wide diversity of prokaryotes exhibiting modern metabolisms that thrived ...
Marshall Craig P., Javaux Emmanuelle J.
doaj  

Distinguishing the hauterivian-barremian sediments in the Karkinitsko-North-Crimean though (Zakhidno-Оktyabrska area) by microfosills

Мінеральні ресурси України, 2022
According to bio- and lithological methods, we have identified and stratified Lower Cretaceous (Neocomian) deposits from well sections: № 29 and 31, which were drilled on the territory of the Zakhidno-Оktyabrska area of the Karkinitsko-North-Crimean ...
O. A. Shevchuk, L. M. Yakushyn, Yu. B. Dorotyak, D. O. Pustovoitova   +3 more
doaj   +1 more source

Biogeochemical, sedimentological and dinoflagellate‐based reconstruction of the Holocene palaeoenvironment of the east Limfjord, Denmark

Boreas, EarlyView.
To assess how the eastern part of the Limfjord system has changed over the Holocene, relative to the wider Limfjord and western Baltic region, a sedimentary succession spanning c. 9600–150 cal. a BP was collected from Nibe Bredning, near Sebbersund, from a shallow coastal inlet along the eastern connection between the Limfjord and the Kattegat (north ...
Gabriella M. Weiss, Jonathan P. Lewis, Paula J. Reimer, David B. Ryves, Peter Rasmussen, Jesper Olsen   +5 more
wiley   +1 more source

The Mountain Plateau hayl as a Specific Form of Karst Depression in the Al-Hajar Mountains (South-Eastern Arabia)

Open Quaternary
This contribution investigates the formation of karst depressions containing metres of fine sediment and prehistoric artefacts at an elevation of around 1000 m a.s.l. in the central part of the Al-Hajar Mountains in south-eastern Arabia.
Inna Mateiciucová, Maximilian Wilding, Miroslav Bubík, Jiří Otava   +3 more
doaj   +1 more source

Heterodonty in the teeth of the turiasaurian sauropod from Angeac‐Charente (Early Cretaceous, southwestern France): Comparison of anatomical and geometric morphometric approaches

Journal of Anatomy, EarlyView.
Turiasaurian teeth from Angeac‐Charente exhibit five dental morphotypes and reveal clear heterodonty and anteroposterior size gradient. Qualitative comparative anatomy quickly and efficiently identifies morphotypes, while 3D geometric morphometrics combined with machine learning refine ambiguous cases, demonstrating that qualitative and quantitative ...
Clémence Le Gouellec, Ronan Allain, Jean Goedert, Romain Pintore, Jackson Carter, Rafael Royo‐Torres, Dominique Augier, Raphaël Cornette   +7 more
wiley   +1 more source

Surface Microornamentation of Demosponge Sterraster Spicules, Phylogenetic and Paleontological Implications

Frontiers in Marine Science, 2020
Siliceous spicules in demosponges exist in a variety of shapes, some of which look like minute spheres of glass. They are called “sterrasters” when they belong to the Geodiidae family (Tetractinellida order) and “selenasters” when they belong to the ...
Paco Cárdenas
doaj   +1 more source

Comprehensive revision of Mallomonas sect. Peroneides stat. nov. (Chrysophyceae) integrating morphology and multigene phylogeny

Journal of Phycology, EarlyView.
Abstract Mallomonas is among the most diverse genera of Chrysophyceae, yet many of its lineages remain taxonomically unresolved due to limited molecular sampling. Mallomonas series Peronoides, historically limited to four species, has posed persistent taxonomic difficulties, most notably the long‐standing and problematic reliance on a rare ...
Petr Knotek, Iva Jadrná, Martin Pusztai, Pavel Škaloud   +3 more
wiley   +1 more source

Ceramic petrography, mineralogy and typology of Eneolithic pottery from Krašnja, Slovenia

Documenta Praehistorica, 2014
In this article, we present newly excavated Eneolithic pottery from the site at Krašnja near Lukovica in central Slovenia. The material was AMS 14C dated and is contemporaneous with archaeological sites from the Ljubljansko barje region in Slovenia. The
Andreja Žibrat Gašparič, Milena Horvat, Breda Mirtič   +2 more
doaj   +1 more source

Contourite erosional and depositional features of the Maastrichtian chalk on Jasmund peninsula (Rügen island, NE Germany)

Sedimentology, EarlyView.
ABSTRACT Seismic‐scale features such as deeply incised submarine valleys and mounded drifts together with ichnological features indicative of discontinuous sedimentation and erosional episodes have recently been documented from the Upper Cretaceous chalk in the southern Baltic Sea area.
Marcel Schlembach, Heiko Hüneke, Mike Reich, Svante Peters, Nele Ahlhaus, Sylvia Weinert, Arwed Gibb   +6 more
wiley   +1 more source

New Findings of Foraminifers and Age Correction of Callovian (Middle Jurassic) Marine Deposits of the Western Caucasus

Journal of Marine Science and Engineering
A comprehensive understanding of Callovian (Middle Jurassic, Mesozoic) sedimentation and paleogeography requires examination of marine deposits of this stage across multiple geological domains on Earth.
Dmitry A. Ruban, Larisa A. Glinskikh
doaj   +1 more source