Enigmatic Late Cretaceous high palaeo-latitude lonestones in Chukotka, northeasternmost Asia

Well-rounded cobbles were encountered within a low-energy restricted marine organic-rich deposit of latest Cretaceous age in Chukotka, NE Asia. The clasts are hydrodynamically incompatible with the inferred quiet depositional environment of the host sediment. Driftwood capable of tree-rafting, glaci...

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Bibliographic Details
Published in:GFF
Main Authors: Ahlberg, Anders, Herman, AB, Raikevich, M, Rees, A, Spicer, RA
Format: Article in Journal/Newspaper
Language:English
Published: Taylor & Francis 2002
Subjects:
Geotechnical Engineering
Russia
dropstones
lonestones
Cretaceous
Chukotka
Online Access:https://lup.lub.lu.se/record/317332
https://doi.org/10.1080/11035890201244197
Description
Summary:Well-rounded cobbles were encountered within a low-energy restricted marine organic-rich deposit of latest Cretaceous age in Chukotka, NE Asia. The clasts are hydrodynamically incompatible with the inferred quiet depositional environment of the host sediment. Driftwood capable of tree-rafting, glacial striations, gastrolith clast clustering, and disrupting clast impact impressions typical of volcanic ejecta were absent, as were signs of traction currents. If indeed ice-rafting is responsible, this supports recent climate models and palaeobotanical data which favour seasonal marine ice cover of high northern latitudes over a wide span of boundary conditions.

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