VERTEBRATE HISTORY IN THE LATE SILURIAN
1992; Estonian Academy Publishers; Volume: 41; Issue: 4 Linguagem: Inglês
10.3176/geol.1992.4.05
ISSN1736-7913
Autores ResumoThe last agnathans occurring in the Wenlock and the lower Ludlow (incl.the Himmiste Beds of the Paadla Stage) disappear in the Uduvere Beds of the Ludlow Paadla Stage.In these beds the first vertebrates, particularly characteristic of the Upper Ludlow (Kuressaare Stage) and Pridoli (Kaugatuma and Ohesaare stages) appear.The paper concentrates on the hedei event, i.e. the replacement of the fauna that took place in the marginal areas of the East European Platform (East and West Baltic, Timan-Pechora Region, the Central Urals), on the British Isles (South Wales), and Severnaya Zemlya.The changes that occurred on that level (Lower Lud- fordian) were not simple environment-based appearances-disappearances, but rather extinction, innovation, and radiation events in the evolution of vertebrates. Attentionis also paid to the later development of the vertebrate fauna, that is to acanthodian, heterostracan-oste- ichthyan, and thelodont events that occurred in the Pridoli.
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