ORBi: Dynamic Late Ordovician climate responses: The cascading effects of expanding continental ice? - 2026

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Dynamic Late Ordovician climate responses: The cascading effects of expanding continental ice?

Forsythe, Ian J.; Brett, Carlton E.; Sullivan, Nicholas B. et al.

2026 • In Geology

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https://hdl.handle.net/2268/346285

DOI
10.1130/g54314.1

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Abstract :

[en] The interplay between astronomical forcing, continental ice volume, and biotic immigration is well studied in the Cenozoic, and documentation of such connections in the Paleozoic is rapidly increasing. Herein, we present analyses from late Katian subtropical marine deposits, revealing a transition from obliquity- (∼33.8 ± 0.46 k.y.) and precession- (∼17−22 k.y.) dominated sedimentation to a regime dominated by obliquity and short eccentricity (∼93−125 k.y.). We term this shift the late Katian transition. Transition from precession- to short eccentricity−dominated sedimentary cycles suggests expansion of ice sheets over Gondwana. This shift precedes a major episode of faunal immigration in Laurentia, which may have been facilitated by this climatic transition.

Disciplines :

Earth sciences & physical geography

Author, co-author :

Forsythe, Ian J.; 1H.N. Fisk Laboratory of Sedimentology, Department of Geosciences, University of Cincinnati, Cincinnati, Ohio 45221, USA

Brett, Carlton E.; 1H.N. Fisk Laboratory of Sedimentology, Department of Geosciences, University of Cincinnati, Cincinnati, Ohio 45221, USA

Sullivan, Nicholas B.; 2Earth and Environmental Systems Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA

Stigall, Alycia L.; 3Department of Earth, Environmental, and Planetary Sciences, University of Tennessee, Knoxville, Tennessee 37996, USA

Da Silva, Anne-Christine ; Université de Liège - ULiège > Département de géologie

Language :

English

Title :

Dynamic Late Ordovician climate responses: The cascading effects of expanding continental ice?

Publication date :

20 April 2026

Journal title :

Geology

ISSN :

0091-7613

eISSN :

1943-2682

Publisher :

Geological Society of America

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://pubs.geoscienceworld.org/gsa/geology/article-pdf/doi/10.1130/G54314.1/7813885/g54314.pdf

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