10.6084/m9.figshare.3453140.v1
Luke Mander
Luke
Mander
Wolfram M. Kürschner
Wolfram M.
Kürschner
Jennifer C. McElwain
Jennifer
C. McElwain
Palynostratigraphy and vegetation history of the Triassic–Jurassic transition in East Greenland
Geological Society of London
2016
data support suggestions
carbon isotope records
Astartekl
marine
UK
vegetation history
sporomorph assemblage zones
Tr
Geology
2016-06-21 11:10:22
Journal contribution
https://geolsoc.figshare.com/articles/journal_contribution/Palynostratigraphy_and_vegetation_history_of_the_Triassic_Jurassic_transition_in_East_Greenland/3453140
<p>We present a palynological study of a terrestrial Triassic–Jurassic (Tr–J; <em>c</em>. 200 Ma) boundary section at Astartekløft, East Greenland. We have generated a new palynostratigraphic scheme and vegetation
history for this locality, and have integrated these with existing carbon isotope records. Samples for palynological analysis
were collected from precisely the same stratigraphic horizons as plant macrofossils and samples used for geochemical analyses.
Our results highlight four local sporomorph assemblage zones that are compositionally distinct from each other at Astartekløft.
The extremely low abundance of <em>Classopollis</em> pollen in all samples, and the pronounced decline of <em>Ricciisporites tuberculatus</em> during the Late Rhaetian are notable features of the sporomorph record of Tr–J vegetation at Astartekløft. Correlation of
Astartekløft and a marine Tr–J boundary section at St Audrie’s Bay, UK, provides no support for the idea that extinction and
diversity loss in terrestrial ecosystems preceded biotic change in marine ecosystems at the Tr–J. Instead, the available data
support suggestions that the onset of the Tr–J biotic crisis was synchronous in terrestrial and marine environments. Peak
extinction among plants at Astartekløft occurred relatively late in the sequence of events across the Tr–J, and may represent
a response to long-term cumulative effects of volcanism at this time.
</p>