Results 51 to 60 of about 1,147 (200)
Rivista Italiana di Paleontologia e Stratigrafia, 1999 Extensive tracts of Devonian and older sedimentary and igneous units occur within the axial region of the western Karakoram Block of northernmost Pakistan over a distance in excess of 200 km between the the headwaters of the Karambar valley in ...
JOHN A. TALENT +5 more
doaj +1 more source
Variability in the Ordovician acritarch Dicrodiacrodium
, 1996 (Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Servais, Thomas +2 more
openaire +1 more source
Geochemistry, Geophysics, Geosystems, Volume 26, Issue 12, December 2025.Abstract Stromatolites archive critical information on Precambrian marine environments, but their geochemical signals are often obscured using complex diagenetic processes. Tonian stromatolites from the Weiji Formation, North China, show selective dolomitization in dark stromatolitic laminae, forming zoned dolomites.
Ziheng Liang +4 more
wiley +1 more source
AGU Advances, Volume 6, Issue 5, October 2025.Abstract Mid‐ to higher‐latitude shallow marine environments are suggested to serve as refugia for organisms during intervals of rapid environmental change associated with hyperthermals. To understand the role of these environments during hyperthermals, we herein investigate the Permian–Triassic environmental crisis, which led to the most severe mass ...
S. Z. Buchwald +18 more
wiley +1 more source
The evolution of reproduction in Ediacaran–Cambrian metazoans
Biological Reviews, Volume 100, Issue 5, Page 2084-2098, October 2025.ABSTRACT The evolution of reproductive style is a fundamental aspect of metazoan life history but has not been explored holistically through the Ediacaran–Cambrian rise of metazoans. Recent molecular clock analyses based on only unequivocal metazoan fossil calibrations suggest that Porifera were present by at least 590 million years ago (Ma), all major
Rachel A. Wood, Mary L. Droser
wiley +1 more source
Acritarchs of the Ediacaran Frecheirinha Formation, Ubajara Group, Northeastern Brazil
Anais da Academia Brasileira de Ciências, 2015 We report for the first time the occurrence of organic-walled microfossils in Ediacaran limestones and marls of the Frecheirinha Formation, Ubajara Group, and the first Precambrian acritarchs so far reported for northeastern Brazil. The assemblage of the
Leticia Chiglino +3 more
doaj +1 more source
Origins and Alteration of Ediacaran Carbonates Recording the Shuram Excursion in Oman
Geochemistry, Geophysics, Geosystems, Volume 26, Issue 5, May 2025.Abstract The Shuram excursion is the largest known negative carbon isotope excursion in Earth's history. Recognized globally, it follows the Ediacaran Gaskiers glaciation and precedes a marked increase in the diversity and complexity of the earliest macroscopic multicellular organisms in the fossil record.
Kristin D. Bergmann +7 more
wiley +1 more source
The Depositional Record, Volume 11, Issue 1, Page 147-181, February 2025.Detailed sedimentologic, petrographic and geochemical analyses of the lacustrine deposits registered on the Ñirihuau Formation middle section in the northern sector of the Ñirihuau Basin are presented. The lacustrine carbonates found within these deposits were analysed to characterise the palaeolake system as well as the carbonate factory of the basin,
Camila Santonja +7 more
wiley +1 more source
Geological Journal, Volume 60, Issue 1, Page 196-222, January 2025.The study examines Cretaceous to Palaeogene sedimentary sequences in the Anambra Basin, part of West African rift basins, utilising geochemical and palynological interpretations to understand organic matter accumulation. Palynofacies and geochemical data indicate a predominantly warm and humid tropical climate during a time of widespread marine ...
Erepamo J. Omietimi +5 more
wiley +1 more source
A peritidal Burgess‐Shale‐type fauna from the middle Cambrian of western Canada
Palaeontology, Volume 68, Issue 1, January/February 2025.Abstract Burgess‐Shale‐type (BST) faunas have proven critical for mapping the Cambrian assembly of animal‐dominated ecosystems, but have so far only been reported from fully subaqueous deposits. Here we integrate evidence from ichnofossils, sedimentary features, and small carbonaceous fossils (SCFs) from the middle Cambrian (Late Guzhangian, Series 3 ...
Giovanni Mussini +2 more
wiley +1 more source