Results 51 to 60 of about 2,004 (204)
Journal of Spectroscopy, Volume 24, Issue 3-4, Page 207-212, 2010., 2010 Laser Raman microspectroscopy was used as a microchemical analysis technique to characterize the wall chemistry of organic‐walled microfossils (acritarchs and prasinophytes) extracted from Proterozoic (Tonian: ca. 900 Myr) and early Palaeozoic (Silurian: ca.
Marie-Claire Dhamelincourt +5 more
wiley +1 more source
The palaeobiogeographical spread of the acritarch Veryhachium in the Early and Middle Ordovician and its impact on biostratigraphical applications [PDF]
, 2014 The genus Veryhachium Deunff, 1954, is one of the most frequently documented acritarch genera, being recorded from the Early Ordovician to the Neogene.
Li, Jun +5 more
core +2 more sources
The lower boundary of the Haljala Regional Stage (Sandbian, Upper Ordovician) in Estonia [PDF]
Estonian Journal of Earth Sciences, 2020 Multi-proxy correlation is used to address the boundary of the Kukruse and Haljala regional stages across the Estonian part of the Baltoscandian Ordovician Palaeobasin.
Tõnn Paiste +3 more
doaj +1 more source
Ordovician chitinozoans and acritarchs from southern and southeastern Turkey [PDF]
Revue de Micropaléontologie, 2007 Revision of the lithostratigraphy of Ordovician deposits in southern and southeastern Turkey led to a re-evaluation of the age assignments of formations identified in the subsurface and at outcrop. Previous datings were based on macrofauna (mainly trilobites and graptolites).
Paris, F. +7 more
openaire +2 more sources
Precise chitinozoan dating of Ordovician impact events in Baltoscandia [PDF]
Journal of Micropalaeontology, 1996 Abstract. The chitinozoan biostratigraphy of four Ordovician impact craters has been investigated. Three of these (Tvären, Kärdla and Lockne) contain complete sequences of early Caradoc age, while the Granby crater contains rocks of late Arenig age yielding two bentonitic horizons at their top. Chitinozoans, together with graptolites and other planktic
Grahn, Yngve +2 more
openaire +2 more sources
Palynostratigraphy and palaeoecology of the Niur Formation, Tikdar section, northwest of Kerman, Central Iran [PDF]
Journal of Stratigraphy and Sedimentology Researches, 2019 Diverse, moderately to well-preserved palynomorphs including acritarchs (sensu stricto), prasinophytes cyst, chitinozoans, scolecodonts, and spores occur in some surface samples (90 meters thereof) of the Niur Formation (200 m thick) at the Tikdar ...
Hossein Hashemi +2 more
doaj +1 more source
The late Ordovician Soom Shale Lagerstȁtte: an extraordinary post-glacial fossil and sedimentary record [PDF]
, 2016 Fossils of the Late Ordovician Soom Shale Lagerstätte are characterized by exceptional preservation of their soft tissues in clay minerals. The low-diversity community lived in an unusual cold-water setting, dominated by anoxic bottom waters, in the ...
Browning, Claire +3 more
core +1 more source
Fossil StudiesThe poor preservation state of chitinozoans recovered from samples of the La Pola (Sandbian–Katian) and Don Braulio formations (Hirnantian-Llandovery), after being processed with standard methods, required significant modifications in processing.
Jessica Gómez +2 more
semanticscholar +1 more source
, 2020 Lower Palaeozoic basins of Western Gondwana (Robin et al. 2004), because of its geographical extent and fossil record. The southern end of this basin is located in north-western Argentina and its outcrops are exposed in the geological provinces of Puna ...
G. Puente, F. Paris
semanticscholar +1 more source
The making of pure quartzose sand in continental interiors: Paraná River (Brazil and Argentina)
Sedimentology, Volume 73, Issue 3, Page 802-837, April 2026.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