نتایج جستجو برای: acritarchs
تعداد نتایج: 104 فیلتر نتایج به سال:
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 ...
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...
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...
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...
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