Results 81 to 90 of about 16,764 (247)
The making of pure quartzose sand in continental interiors: Paraná River (Brazil and Argentina)
Sedimentology, EarlyView.ABSTRACT As part of a comprehensive project on sedimentary processes in South America, this study focuses on sediment generation in the intracratonic Paraná Basin and monitors the evolution of sand composition along the Paraná River from central Brazil to the Río de la Plata estuary in Argentina.
Eduardo Garzanti +5 more
wiley +1 more source
Мінеральні ресурси УкраїниSilicate analyzes of siltstones, argillites, sandstones, gravelites, and conglomerates were used to examine the lithochemical features of the clastic rocks of the Hrushka Formation.
T. M. Sokur +2 more
doaj +1 more source
Ediacaran reorganization of the marine phosphorus cycle
Proceedings of the National Academy of Sciences of the United States of America, 2020 Significance The evolution of macroscopic animals in the latest Proterozoic Eon is associated with many changes in the geochemical environment, but the sequence of cause and effect remains a topic of intense research and debate. In this study, we use two
T. Laakso +3 more
semanticscholar +1 more source
Ediacaran survivors in the Cambrian: suspicions, denials and a smoking gun
Geological Magazine, 2022 The relative timing of extinctions and originations is a foundation for reconstructing evolutionary causes. However, there has been a tendency to dismiss reported Ediacaran holdovers in favour of effective extinction around the Cambrian boundary.
Jennifer F. Hoyal Cuthill
semanticscholar +1 more source
Sedimentology, EarlyView.ABSTRACT One of the largest wetlands on Earth, the Brazilian Pantanal contains roughly 10 000 natural lakes, about 1000 of which are hypersaline. In these environmentally stressful settings, animal life struggles to survive, while cyanobacteria form extensive mats.
Lucas V. Warren +5 more
wiley +1 more source
Anais da Academia Brasileira de Ciências, 2014 This study reports the first known occurrence of the Ediacaran fauna in northeastern Brazil (at Pacujá Municipality, northwestern state of Ceará) and presents preliminary interpretations of its significance.
FRANCISCO R.G. BARROSO +3 more
doaj +1 more source
Food sources for the Ediacara biota communities
Nature Communications, 2020 Complex macroscopic organisms are first found in the Ediacaran period, but their ecology during this time is not well understood. Here, Bobrovskiy et al.
Ilya Bobrovskiy +3 more
doaj +1 more source
Diversity of the Vendian fossils of Podillia (Western Ukraine)
Geo&Bio, 2020 Diversity ofVendian fossil associations is a common feature. The diversity depends on many factors: firstly, physical conditions in the basin, in which animals lived (i.e.
Volodymyr Grytsenko
doaj +1 more source
Animal emergence during Snowball Earths by thermosynthesis in submarine hydrothermal vents [PDF]
, 2009 Darwin already commented on the lateness in the fossil record of the emergence of the animals, calling it a valid argument against his theory of evolution^1^.
Anthonie W. J. Muller
core +2 more sources
Ediacaran metazoan fossil record from South America and its implications in the studies about origin and complexification of animal life [PDF]
Geologia USP. Série Científica, 2013 The Ediacaran Period marks the first appearance of complex macroscopic organisms in the fossil record. Current evidence indicates that Ediacara biota is composed of animals, groups of extinct giant protists, algae and other organisms without proven ...
Bruno Becker Kerber +4 more
doaj +1 more source