The Cenomanian/Turonian boundary in light of new developments in terrestrial palynology

authored by

Francesca Galasso, Ulrich Heimhofer, Elke Schneebeli-Hermann

Abstract

The Cenomanian/Turonian boundary interval is associated with an oceanic anoxic event (OAE 2, 94.0 Ma) during one of the warmest episodes in the Mesozoic. To date, plant responses to these climatic conditions are known only from the northern mid-latitudinal succession in Cassis, France. There, conifer-dominated and angiosperm-dominated vegetation types alternate. However, whether the exceptional environmental conditions had an impact on plant reproduction is unknown to date. We applied a new environmental proxy based on spore and pollen teratology on palynological samples from the Cassis succession, to explore if this phenomenon also occurs across the OAE 2. The observed frequencies of<1% malformed spores and pollen grains suggest that plant reproduction was not affected during the Cenomanian/Turonian boundary interval. While the effects of continental Large Igneous Province(s) on plant reproduction have shown to produce abnormal spore or pollen morphologies as evidence for severe environmental pollution, by contrast the effects of oceanic LIP(s) seems to be inconsequential.

Organisation(s)

Institute of Geology

External Organisation(s)

Universität Zürich (UZH)

Type

Article

Journal

Scientific reports

Volume

13

ISSN

2045-2322

Publication date

2023

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

General

Sustainable Development Goals

SDG 12 - Responsible Consumption and Production

Electronic version(s)

https://doi.org/10.1038/s41598-023-30072-6 (Access: Open)