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