The "last" tentaculitoids

An earliest Famennian (Late Devonian) record of tentaculitoids (an extinct 'class' of small calcareous conical shells) preserved as palynomorphs is documented from Sosnogorsk in the Komi Republic of Russia. These were preserved in considerable abundance in a near-shore shallow lagoon subje...

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Bibliographic Details
Published in:Palynology 2017-12, Vol.41 (sup1), p.178-188
Main Authors: Marshall, J. E. A, Tel'nova, O. P
Format: Article
Language:English
Subjects:
Commonwealth of Independent States
Devonian
Europe
extinction
Famennian
Frasnian-Famennian
invertebrate
Komi Russian Federation
lithostratigraphy
lower Famennian
Mollusca
morphology
nowakiids
Paleontology
Paleozoic
palynomorphs
Russian Federation
Sosnogorsk Russian Federation
Tentaculitida
tentaculitoids
Upper Devonian
Zadonsk Horizon
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Summary:An earliest Famennian (Late Devonian) record of tentaculitoids (an extinct 'class' of small calcareous conical shells) preserved as palynomorphs is documented from Sosnogorsk in the Komi Republic of Russia. These were preserved in considerable abundance in a near-shore shallow lagoon subjected to marine flooding with euxinia. Four forms of nowakiid tentaculitoids plus related aberrant forms are documented. They represent evidence for survival of the nowakiids into the earliest Famennian and hence post-date the Frasnian-Famennian mass extinction. It is hypothesised that the Frasnian and younger occurrence of tentaculitoids as palynomorphs may relate to a changing balance of carbonate and organic matter in their shells driven by the environmental conditions of the Frasnian-Famennian mass extinction.
ISSN:0191-6122
1558-9188
DOI:10.1080/01916122.2017.1362215