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Geochronology of Pliocene volcanism in the Dzhavakheti Highland (the Lesser Caucasus). Part 2: Eastern part of the Dzhavakheti Highland. Regional geological correlation

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In commemoration of Valerii Arkad’evich Krasheninnikov (1927–2008)

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Stratigraphy and Geological Correlation : Volume 14

Triassic ammonoids of Northeast Asia: Diversity and evolutionary stages

Content Provider	Springer Nature Link
Author	Konstantiv, A. G.
Copyright Year	2008
Abstract	The history of Triassic ammonoids in the Siberian Province of the Boreal Paleobiogeographic Realm is recorded in detail in sections of Northeast Asia. In this region there are known at present 123 Triassic ammonoid genera of 41 family and 3 orders. Six stages and 14 substages are defined based on main levels of taxonomic restructuring of Triassic ammonoids, changes in their genera and families diversity, and changes in percentage of endemic and cosmopolitan taxa in assemblages. Each stage and substage is characterized by individual taxonomic composition of ammonoids, dominant groups, trends of changes in taxonomic diversity, and percentages of endemic and cosmopolitan taxa. Boundaries of ammonoid evolution stages coincide as a rule with boundaries of series and stages, whereas boundaries of evolutionary substages match those of substages. In the history of Triassic ammonoids of Northeast Asia, the periods of a rather monotonous fauna represented mainly by cosmopolitan or panboreal taxa (early Induan, early Olenekian, early Anisian, late Anisian, early Carnian, early and middle Norian) alternated with periods, typical of which were higher rates of taxa origination and endemism of ammonoids (late Induan, late Olenekian, middle Anisian, Ladinian, late Carnian). Changing degree of cosmopolitism and endemism of Triassic ammonoid faunas from Northeast Asia is shown to be connected with global eustatic sea-level fluctuations and climatic changes.
Starting Page	490
Ending Page	502
Page Count	13
File Format	PDF
ISSN	08695938
Journal	Stratigraphy and Geological Correlation
Volume Number	16
Issue Number	5
e-ISSN	15556263
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2008-10-03
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	ammonoids Triassic taxonomic diversity stages in ammonoid evolution Northeast Asia Archaeology Sedimentology Geophysics/Geodesy Structural Geology Historical Geology
Content Type	Text
Resource Type	Article
Subject	Geology Stratigraphy Paleontology

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