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Implications of the Newark Supergroup-based astrochronology and geomagnetic polarity time scale (Newark-APTS) for the tempo and mode of the early diversification of the Dinosauria

Implications of the Newark Supergroup-based astrochronology and geomagnetic polarity time scale (Newark-APTS) for the tempo and mode of the early diversification of the Dinosauria
Implications of the Newark Supergroup-based astrochronology and geomagnetic polarity time scale (Newark-APTS) for the tempo and mode of the early diversification of the Dinosauria
The Newark-APTS established a high-resolution framework for the Late Triassic and Early Jurassic. Palaeomagnetic polarity correlations to marine sections show that stage-level correlations of continental sequences were off by as much as 10 million years. New U–Pb ages show the new correlations and the Newark basin astrochronology to be accurate. Correlation of Newark-APTS to the Chinle Formation/Dockum Group, Glen Canyon Group, Fleming Fjord Formation and Ischigualasto Formation led to the following conclusions: (1) there are no unequivocal Carnian-age dinosaurs; (2) the Norian Age was characterised by a slowly increasing saurischian diversity but no unequivocal ornithischians; (3) there was profound Norian and Rhaetian continental provinciality; (4) the classic Chinle-, Germanic- and Los Colorados-type assemblages may have persisted to the close of the Rhaetian; (5) the distinct genus-level biotic transition traditionally correlated with the marine Carnian–Norian is in fact mid-Norian in age and within published error of the Manicouagan impact; (6) the end-Triassic marine and continental extinctions as seen in eastern North America were contemporaneous; and (7) compared to Triassic communities, Hettangian and Sinemurian age terrestrial communities were nearly globally homogenous and of low diversity. Consequently, the complex emerging picture of dinosaur diversification demands biostratigraphically-independent geochronologies in each of the faunally-important regions.
chinle, cyclostratigraphy, dinosaurs, early jurassic, fleming fjord, geochronology, glen canyon, ischigualasto, late triassic
1755-6910
201-229
Olsen, Paul E.
bdbec40b-82ed-41ac-8028-b6c333206f16
Kent, Dennis V.
8d441507-6a10-4db7-8d28-db17ccb9fb69
Whiteside, Jessica H.
5d9ad7aa-eba3-4ad9-9f6f-81be71b6829b
Olsen, Paul E.
bdbec40b-82ed-41ac-8028-b6c333206f16
Kent, Dennis V.
8d441507-6a10-4db7-8d28-db17ccb9fb69
Whiteside, Jessica H.
5d9ad7aa-eba3-4ad9-9f6f-81be71b6829b

Olsen, Paul E., Kent, Dennis V. and Whiteside, Jessica H. (2010) Implications of the Newark Supergroup-based astrochronology and geomagnetic polarity time scale (Newark-APTS) for the tempo and mode of the early diversification of the Dinosauria. [in special issue: Late Triassic Terrestrial Biotas and the Rise of Dinosaurs] Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 101 (3-4), 201-229. (doi:10.1017/S1755691011020032).

Record type: Article

Abstract

The Newark-APTS established a high-resolution framework for the Late Triassic and Early Jurassic. Palaeomagnetic polarity correlations to marine sections show that stage-level correlations of continental sequences were off by as much as 10 million years. New U–Pb ages show the new correlations and the Newark basin astrochronology to be accurate. Correlation of Newark-APTS to the Chinle Formation/Dockum Group, Glen Canyon Group, Fleming Fjord Formation and Ischigualasto Formation led to the following conclusions: (1) there are no unequivocal Carnian-age dinosaurs; (2) the Norian Age was characterised by a slowly increasing saurischian diversity but no unequivocal ornithischians; (3) there was profound Norian and Rhaetian continental provinciality; (4) the classic Chinle-, Germanic- and Los Colorados-type assemblages may have persisted to the close of the Rhaetian; (5) the distinct genus-level biotic transition traditionally correlated with the marine Carnian–Norian is in fact mid-Norian in age and within published error of the Manicouagan impact; (6) the end-Triassic marine and continental extinctions as seen in eastern North America were contemporaneous; and (7) compared to Triassic communities, Hettangian and Sinemurian age terrestrial communities were nearly globally homogenous and of low diversity. Consequently, the complex emerging picture of dinosaur diversification demands biostratigraphically-independent geochronologies in each of the faunally-important regions.

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More information

Published date: September 2010
Keywords: chinle, cyclostratigraphy, dinosaurs, early jurassic, fleming fjord, geochronology, glen canyon, ischigualasto, late triassic
Organisations: Paleooceanography & Palaeoclimate

Identifiers

Local EPrints ID: 354766
URI: http://eprints.soton.ac.uk/id/eprint/354766
ISSN: 1755-6910
PURE UUID: 57d68b60-909f-4877-850e-fdd5e7908d88

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Date deposited: 19 Jul 2013 10:11
Last modified: 14 Mar 2024 14:24

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Contributors

Author: Paul E. Olsen
Author: Dennis V. Kent

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