Results 21 to 30 of about 12,978 (245)
Ediacaran organic-rich Kalus Beds of western Ukraine and NW Moldova: mineralogy, total organic carbon content and hydrocarbon potential [PDF]
Estonian Journal of Earth Sciences, 2021 The Ediacaran succession occurs at the southwestern slope of the East European Platform from the Black Sea to the Lublin-Podlasie Basin. It includes a black shale interval in Ukraine represented by the Kalus Beds which may have hydrocarbon source rock ...
Natalia Radkovets +3 more
doaj +1 more source
Red to Green: A Lipid Biomarker Record of Tonian-Ediacaran Algae in Siberia. [PDF]
GeobiologyABSTRACT Multiple lines of evidence point to a major diversification of Eukarya in the late Tonian period, ca. 800–720 Ma ago. Regular steranes, lipid biomarkers primarily sourced from eukaryotes, are first unambiguously reported from multiple sites. Here, we present lipid biomarker stratigraphic records from two drill‐cores from the Lena‐Anabar Basin ...
Rizzo AI +7 more
europepmc +2 more sources
Redox-Controlled Ammonium Storage and Overturn in Ediacaran Oceans
Frontiers in Earth Science, 2021 As a key nutrient, nitrogen can limit primary productivity and carbon cycle dynamics, but also evolutionary progress. Given strong redox-dependency of its molecular speciation, environmental conditions can control nitrogen localization and ...
Christian Hallmann +9 more
doaj +1 more source
Carbonate storm deposits and C, O isotopes of the Lagoa do Jacaré Formation (Ediacaran) in the Paraopeba area, Bambuí Group, Brazil [PDF]
Brazilian Journal of Geology, 2022 A section investigated in the region of Paraopeba, Minas Gerais, provided detailed sedimentologic, stratigraphic and chemostratigraphic data from the Ediacaran Lagoa do Jacaré Formation, Bambuí Group, Southeast Brazil.
Marcio Vinicius Santana Dantas +6 more
doaj +1 more source
Evolution of Holdfast Diversity and Attachment Strategies of Ediacaran Benthic Macroalgae
Frontiers in Earth Science, 2021 Holdfast morphologies and attachment strategies of benthic macroalgae are somewhat flexible and controlled by both the substrate condition and species.
Xiaopeng Wang +15 more
doaj +1 more source
Stratigraphy of the Khuvsgul Group, Mongolia
Mongolian Geoscientist, 2021 The Khuvsgul Group (Khuvsgul Province, Mongolia) is a Late Neoproterozoic to Cambrian carbonate-dominated succession that includes minor glacial diamictite and one of the largest known ore-grade phosphate deposits in the world.
Eliel Anttila +2 more
doaj +1 more source
Геодинамика и тектонофизика, 2023 Studies have been made of the carbon and strontium isotope composition in carbonate sediments of the Khorbusuonka group and Kessyusa formation corresponding to the Upper Vendian in deep Khastakhskaya-930 and Burskaya-341-0 boreholes at the northeastern ...
B. B. Kochnev +2 more
doaj +1 more source
A Great late Ediacaran ice age
National Science Review, 2023 The emergence of the Ediacara biota soon after the Gaskiers glaciation ca. 580 million years ago (Ma) implies a possible glacial fuse for the evolution of animals.
Rui-Min Wang +9 more
semanticscholar +1 more source
Periodic ocean oxygenation events during the mid-Ediacaran
The Ediacaran Gaskiers Glaciation (579.78–579.44 million years ago) is the last major climatic event of the Neoproterozoic, but the contemporaneous ocean redox conditions remain unclear.
Timothy Lenton (21069113) +4 more
core +6 more sources
GSA Bulletin, 2023 The transition from the terminal Ediacaran to early Cambrian (ca. 550−530 Ma) witnessed both the decline of Ediacaran-type soft-bodied and skeletal biota and the rapid diversification of Cambrian-type skeletal biota, which dominate the Terreneuvian (ca ...
F. Bowyer +7 more
semanticscholar +1 more source