Results 101 to 110 of about 12,911 (237)
Microbial endolithic community at Meteor Crater
Meteoritics &Planetary Science, Volume 61, Issue 6, Page 955-962, June 2026.Abstract Postimpact recovery and evolution in response to climate changes produced a modern ecosystem at Meteor Crater dominated by a grassland and woodland of piñon and juniper, which has been used to evaluate floral and megafaunal consequences of impact cratering during the Phanerozoic Eon of complex life.
David A. Kring, Charles S. Cockell
wiley +1 more source
Fractionation of carbon and oxygen isotopes in 13C-rich Palaeoproterozoic dolostones in the transition from medium-gradegreenschist facies: a case study from the Kola Superdeep Drillhole [PDF]
, 2003 Samples from the Kola Superdeep Drillhole (12 262 m), a deep drillhole (1060 m), and from the surface, seaprated by only around 10 km, provided a unique opportunity for direct tracing of delta(13)C and delta(18)O changes through a low- to high-grade ...
Fallick, A.E. +3 more
core
Sedimentology, Volume 73, Issue 4, Page 1225-1243, June 2026.ABSTRACT Thin ferruginous sandy crusts are common on top of sandstone beds in the Early Permian post‐glacial deposits of the Paraná Basin in southern Brazil. These crusts usually preserve wrinkle structures, suggesting that they might be a product of microbial mediation.
Patrícia Weschenfelder +2 more
wiley +1 more source
Precambrian glaciations and the evolution of the atmosphere
Annales GeophysicaePrecambrian glaciations appear to be confined to two periods, one in the early Proterozoic between 2.5 and 2 Gyears BP (Before Present) and the other in the late Proterozoic between 1 and 0.57 Gyear BP.
J. H. Carver, I. M. Vardavas
doaj
Geochemical environments of the Archean-Proterozoic
Доклады Академии наук, 2019 In the Precambrian section, there is a change of Archean calcite carbonate rocks to magnesia and ferrous in the Proterozoic. This is correlated with the massive development of cyanobacteria, the absorption of which carbon dioxide and the generation of oxygen, led to a change in the acidic reduction conditions of Archaean alkaline oxidizing in the ...
openaire +2 more sources
Willemite Mineralisation in Namibia and Zambia
, 2008 Willemite mineralisation of several Zn-Pb deposits hosted in the Proterozoic carbonates of Namibia and Zambia has been rather neglected in the literature on zinc ores of southern Africa.
Terracciano, Rosario
core
Stratigraphic correlation of upper Proterozoic rocks of northwestern Canada
, 1977 In the northwestern part of the Canadian Shield upper Proterozoic rocks of Banks Island, Brock Inlier, Coppermine area (Rae Group), Minto Arch of Victoria Island, and some small inliers have all been considered as parts of the Amundsen Basin ...
Grant M. Young
core +1 more source
Sedimentology, Volume 73, Issue 4, Page 945-964, June 2026.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
Sedimentology, Volume 73, Issue 4, Page 883-913, June 2026.ABSTRACT The c. 1 Ga Diabaig Formation of north‐west Scotland preserves diverse lacustrine and fluvial facies and abundant microbial and non‐microbial surficial sedimentary features. 172.6 m of section was logged across seven localities to assess the distribution of microbially induced sedimentary structures (MISS) relative to lithofacies, substrate ...
Seán T. Herron +2 more
wiley +1 more source
Dating the cyanobacterial ancestor of the chloroplast
, 2009 Cyanobacteria have played a pivotal role in the history of life on Earth being the first organism to carry out oxygenic photosynthesis, which changed atmospheric chemistry and allowed the evolution of Eukarya.
Luisa Falcon +2 more
core