نتایج جستجو برای: acritarchs

تعداد نتایج: 104  

Journal: :Swiss Journal of Palaeontology 2023

Abstract Well-preserved Carnian (Late Triassic) palynomorphs are rare in Switzerland, despite sediments include one of the important plant fossil localities, Neue Welt near Basel. Modern detailed palynological studies on Triassic general and especially scarce, most were carried out more than 50 years ago. Nevertheless (Late) still yield surprises for research. Here, we present results re-study ...

Journal: :Review of Palaeobotany and Palynology 2021

New boreholes have enabled, for the first time, extensive palynological sampling through entire Lopingian Zechstein sequence of northeast England. Palynomorph assemblages been recovered from throughout all five evaporation-replenishment cycles (EZ1–EZ5). These are dominated by pollen grains, with rare trilete spores, and even rarer marine forms such as acritarchs foraminiferal test linings. The...

Journal: :Review of Palaeobotany and Palynology 2022

Assemblages of cryptospores were reported and detailed for the first time from Upper Ordovician Brazil. These assemblages recovered diamictites shales with dropstones Iapó Formation, Rio Ivaí Group, Paraná Basin. The analyzed sequence represents Hirnantian glacial deposits containing well-preserved palynomorphs low thermal maturity total organic carbon. cryptospore comprise monads, dyads, perma...

2005
André Kempe Richard Wirth Wladyslaw Altermann Robert W. Stark William Schopf Wolfgang M. Heckl

The taphonomic nanostructure of acritarch cell walls from the c. 650 million years old Chichkan Formation was studied with optical microscopy (OM), Raman spectroscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), and transmission electron microscopy (TEM). The integration of high-resolution methods and classical optical microscopy allows for the assessment of the relations...

Journal: :Anais da Academia Brasileira de Ciencias 2015
Alexander W A Kellner

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