Results 21 to 30 of about 888,472 (253)

Cambrian Trace Fossil Zoophycos from the Czech Republic

Geologica Carpathica, 2015
Lobate and helical ichnofossils attributable to Zoophycos found in Middle Cambrian shales of the Palác Hill in the Železné Hory Mountains (eastern Bohemia) represent the oldest occurrence of this ichnogenus.
Doucek Jan, Mikuláš Radek
doaj   +1 more source

The Trouble with Ichnofacies

Geosciences
For about 60 years, the ichnofacies model has been used to identify trace fossil assemblages associated with sedimentary environments. However, the ichnofacies model faces many problems, including: (1) how ichnofacies are defined; (2) non-environmental ...
Spencer G. Lucas
doaj   +1 more source

Ichnotaxonomy and paleobiology of a bird track assemblage from the Miocene Vinchina Formation of La Rioja Province, Argentina

Acta Palaeontologica Polonica
This study examines the bird ichnoassemblage of the Miocene Vinchina Formation (La Rioja Province, Argentina), recorded in fluvio-lacustrine environments.
Martin E. Farina, Verónica Krapovickas, Claudia A. Marsicano   +2 more
doaj   +1 more source

Anomuran and brachyuran trackways and resting trace from the Pliocene of Valduggia (Piedmont, NW Italy): environmental, behavioural, and taphonomic implications

Natural History Sciences, 2016
We report a rich ichnofacies including trackways and a resting trace made by indeterminate anomuran and brachyuran crabs, and other organic sedimentary structures produced by invertebrates.
Giovanni Pasini, Angela Baldanza, Lorenzo M. Gallo, Alessandro Garassino, Hiroaki Karasawa   +4 more
doaj   +1 more source

Impact of trace metal concentrations on coccolithophore growth and morphology: laboratory simulations of Cretaceous stress [PDF]

Biogeosciences, 2017
The Cretaceous ocean witnessed intervals of profound perturbations such as volcanic input of large amounts of CO2, anoxia, eutrophication and introduction of biologically relevant metals.
G. Faucher, L. Hoffmann, L. T. Bach, C. Bottini, E. Erba, U. Riebesell   +5 more
doaj   +1 more source

Dinosaur footprints and other ichnofauna from the cretaceous Kem Kem beds of Morocco. [PDF]

PLoS ONE, 2014
We describe an extensive ichnofossil assemblage from the likely Cenomanian-age 'lower' and 'upper' units of the 'Kem Kem beds' in southeastern Morocco.
Nizar Ibrahim, David J Varricchio, Paul C Sereno, Jeffery A Wilson, Didier B Dutheil, David M Martill, Lahssen Baidder, Samir Zouhri   +7 more
doaj   +1 more source

W poszukiwaniu kwiatu nietoty. „Literatura kopalna” a paleobotanika

Wielogłos, 2023
In Search of the Nietota Flower. „Fossil Literature” and Paleobotany The article focuses on the issues of paleontology, the science of plant fossils, with particular emphasis on paleobotanical ...
Tomasz Kaliściak
doaj   +1 more source

A Novel Modified Petroresin Particle (MPRP) With Enhanced Oil–Water Selectivity for Cold Production in Heavy Oil Reservoirs

Advanced Functional Materials, EarlyView.
A novel oil–water selective conformance control agent, MPRP, is prepared via hydrophilic grafting and mechanical granulation. MPRP uniformly disperses in water, cohesively expands upon aging, and readily dissolves in the oil phase. During conformance control, it selectively aggregates in water channeling pathways to form effective plugs without ...
Guang Zhao, Dongfang Lv, Chang Liu, Changxu Wu, Yifei Liu, Caili Dai, Huazhou Li   +6 more
wiley   +1 more source

Sedimentary Facies, Architectural Elements and Trace Fossils of Kashkan Formation, Folded Zagros Zone in SW Iran [PDF]

Journal of Sciences, Islamic Republic of Iran, 2011
The Kashkan Formation (Paleocene to Middle Eocene), consists of conglomerate, sandstone, and siltstone in the Zagros Folded zone, southwest Iran. Type of the sedimentary facies, architectural elements and trace fossils show that Kashkan deposits were ...
N Abbassi
doaj  

Can Elastomers Combine Stiffness, Toughness and Fatigue Resistance?

Advanced Materials, EarlyView.
This review studies how the molecular and macroscopic architecture of elastomers influence their mechanical properties including: stiffness, stretchability, toughness, fatigue resistance, and damping behavior. By linking the structure to performance, it proposes design principles for advanced elastomeric systems that combine mechanical properties ...
Eva Baur, Esther Amstad
wiley   +1 more source