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A bloom of Tympanicysta Balme (green algae of zygnematalean affinities) at the Permian-Triassic boundary

Sergey A. AFONIN, Sophia S. BARINOVA & Valentin A. KRASSILOV

en Geodiversitas 23 (4) - Pages 481-487

Published on 28 December 2001

Filamentous microfossils Tympanicysta Balme, formerly interpreted as conidia of ascomycetes, are similar to zygnemataceous algae Spirogyra Link in the general morphology, folding of transverse septa, chloroplasts and akinetes. Their rise at about the Permian-Triassic boundary is, therefore, unrelated to the boundary "fungal event", but is rather a consequence of a Permian-Triassic widespread ponding and swamping of river systems at the initial stage of the end Permian transgression.

Keywords :

Zygnematales, Tympanicysta, Permian-Triassic boundary, fossil algae

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