نتایج جستجو برای: acritarchs

تعداد نتایج: 104  

Journal: :Rapport Grønlands Geologiske Undersøgelse 1988

Journal: :Paleobiology 2022

Abstract The Cambrian evolutionary radiations are marked by spectacular biotic turnovers and the establishment of increasingly tiered food chains. At base these chains primary producers, which in fossil record chiefly represented among organic-walled microfossils. majority microfossil remains have traditionally been attributed to an informal category incertae sedis called “acritarchs,” based en...

Journal: :Rapport Grønlands Geologiske Undersøgelse 1980

Journal: :Anais da Academia Brasileira de Ciencias 2015
Leticia Chiglino Claudio Gaucher Alcides N Sial Valderez P Ferreira

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 Frecheirinha Formation represents a low-diversity microflora comprising Leiosphaeridia, Lophosphaeridium and subordinated Bavlinella (=Sphaero...

Journal: :Bulletin Grønlands Geologiske Undersøgelse 1993

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