Miospore Evolution from the Ordovician to the Silurian

[en] The definition of the term cryptospore is amended to include only spores thought to be produced by embryophytes and to exclude all enigmatic palynomorphs. Cryptospores are included here in the miospore group.The oldest published assemblage of typical cryptospores is Llanvirn in age. The evolution of cryptospore assemblages is very slow from the Llanvirn to the early Llandovery. The Telychian and Sheinwoodian stages are periods of drastic impoverishment in cryptospore biodiversity, followed by an important modification in miospore assemblages. This step in the evolution of the vegetation is correlated with the rapid transgression of seas on the continent during the early Llandovery. On the other hand, the Hirnantian glaciation does not affect diversity of the miospore assemblages.

Disciplines :

Earth sciences & physical geography

Author, co-author :

Steemans, Philippe ; Université de Liège - ULiège > Département de géologie > Paléobotanique - Paléopalynologie - Micropaléontologie (PPM)

Language :

English

Title :

Miospore Evolution from the Ordovician to the Silurian

Publication date :

December 2000

Journal title :

Review of Palaeobotany and Palynology

ISSN :

0034-6667

eISSN :

1879-0615

Publisher :

Elsevier, Netherlands

Volume :

113

Issue :

1-3

Pages :

189-196

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 25 May 2009

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