Journal
PALAEOBIODIVERSITY AND PALAEOENVIRONMENTS
Volume 100, Issue 3, Pages 593-603Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s12549-019-00415-1
Keywords
Ossa-Morena Zone; Eifelian-Givetian; Palynology; Conodonts; Biotic crisis
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Funding
- Fundacao para a Ciencia e a Tecnologia (Portugal) [SFRH/BD/23787/2005]
- Research Plan of the Institute of Geology of the Czech Academy of Sciences [RVO67985831]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/23787/2005] Funding Source: FCT
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The Kacak Event is one of the several prominent Devonian climatic and biotic perturbations with a supra-regional to global extent. Its record can be traced in the litho- and biostratigraphy of uppermost Eifelian-lowermost Givetian strata and with multiple geochemical and geophysical proxies. In southwest Iberia, within southwestern Ossa-Morena Zone domains, there are rare, scattered Early-Middle Devonian limestone occurrences. One of these occurrences-the Odivelas Limestone type locality-is revisited in terms of conodont biostratigraphy and palynology and the results compared with previous data on reef macrofauna and magnetic susceptibility stratigraphy. The new data show that this locality is probably within the Polygnathus hemiansatus zone, i.e. of the earliest Givetian age. The palynological content of a ca. 2 m of black, organic-rich, fine grained limestone section is dominated, in varied proportions, by amorphous organic matter, putative fungal hyphae, and prasinophycean algae. The results are interpreted as an indication of high organic productivity and deposition in hypoxic to anoxic settings and probable biotic crisis, in both marine and terrestrial realms, connected with the Middle Devonian Kacak Event. The similarity of this record with other Devonian events is discussed.
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