The ‘last’ tentaculitoids
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 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.
178-188
Marshall, J.E.A.
cba178e3-91aa-49a2-b2ce-4b8d9d870b06
Tel'nova, O.P.
27d7d175-68c7-493d-8246-d4a068648b5f
22 December 2017
Marshall, J.E.A.
cba178e3-91aa-49a2-b2ce-4b8d9d870b06
Tel'nova, O.P.
27d7d175-68c7-493d-8246-d4a068648b5f
Abstract
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.
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e-pub ahead of print date: 15 December 2017
Published date: 22 December 2017
Identifiers
Local EPrints ID: 416816
URI: http://eprints.soton.ac.uk/id/eprint/416816
ISSN: 0191-6122
PURE UUID: 3aa4462e-c7c5-44f2-bfa0-dc8e2bc35b20
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Date deposited: 11 Jan 2018 17:30
Last modified: 16 Mar 2024 02:35
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Author:
O.P. Tel'nova
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