Results 31 to 40 of about 3,539 (164)
, 2011 The Cambrian rocks of Wales mostly lie within the Avalon composite terrane, apart from a small area of Cambrian rocks of the Monian composite terrane that is discussed in Chapter 9.
Molyneux, S.G., Rushton, A.W.A.
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The Depositional Record, Volume 12, Issue 1, February 2026.The Pennsylvanian landscape in the Forest City basin was characterised by low‐lying lycopod tree and fern swamp forests with persistently high groundwater tables and adjacent fluvial channel, floodplain and upland environments. The occurrence of abundant charcoal within a specific thin interval in the Cherokee Group indicates substantial wildfire ...
Dustin Northrup +3 more
wiley +1 more source
New results of studies on the fossils in the Lower Cambrian sediment deposit of the Söderfjärden [PDF]
Bulletin of the Geological Society of Finland, 1982 Fossils Mickwitzia monilifera and olenellid trilobite fragments are found in the greenish grey shale in the lower sediment formation of Söderfjärden at a depth of 237.8 and 278.05 m.
R. Tynni
doaj +1 more source
Proterozoic and Early Cambrian Protists: Evidence for Accelerating Evolutionary Tempo [PDF]
, 2014 In rocks of late Paleoproterozoic and Mesoproterozoic age (ca. 1700-1000 million years ago), probable eukaryotic microfossils are widespread and well preserved, but assemblage and global diversities are low and turnover is slow.
Knoll, Andrew
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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
Biostratigraphy of Acritarchs and Chitinozoans in Ordovician Strata from the Fazel Abad Area, Southeastern Caspian Sea, Alborz Mountains, Northern Iran: Stratigraphic Implications [PDF]
Journal of Sciences, Islamic Republic of Iran, 2017 Sixty-four surface samples from the Lower Palaeozoic rock units (mainly Lalun,Abastu and Abarsaj formations) near Kholin-Darreh village in the Fazel Abad area,southeastern the Caspian Sea, Northern Iran, were analyzed to determine their agerelationships.
M. Ghavidel-syooki
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Geosciences, 2016 Sphaeromorphic algal cysts, most probably of the prasinophyte Tasmanites, and acanthomorphic acritarch vesicles, most probably Solisphaeridium, occur in a single 20 cm thick bed of micritic limestone in the lower part of the Middle Devonian (Givetian ...
John A. Chamberlain +2 more
doaj +1 more source
Devonian palynological assemblages from the San Antonio x-1 Borehole, Tarija Basin, northwestern Argentina [PDF]
, 2011 The palynological analysis of the 2548-3628 m interval of the San Antonio x-1 Borehole in northwestern Argentina is presented. The illustrated palynoflora is composed of 96 species represented by diverse palynological groups such as trilete spores and ...
Di Pasquo, M. M., Noetinger, S.
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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
Late Cambrian acritarchs from the Santa Rosita Formation: implications for the Cambrian-Ordovician boundary in the eastern Cordillera of northwest Argentina [PDF]
, 2003 Marine phytoplankton from the Late Cambrian are described for the first time in the Eastern Cordillera of northwest Argentina. The acritarch assemblage was recovered from an offshore lower mudstone unit towards the base of the Casa Colorada Member (Santa
Buatois, Luis Alberto +2 more
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