Scratch circles from the Ediacaran and Cambrian of Arctic Norway and southern Africa, with a review of scratch circle occurrences

Scratch circles—bedding plane parallel sedimentary structures formed by the passive rotation of a tethered organism into the surrounding sediment—are relatively rare in the geological record. Here new occurrences of scratch circles are described from the Ediacaran–Cambrian Stáhpogieddi Formation, Di...

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Bibliographic Details
Published in:Bulletin of Geosciences
Main Authors: Jensen, S, Högström, AES, Almond, J, Taylor, WL, Meinhold, G, Høyberget, M, Ebbestad, JOR, Agić, H, Palacios, T
Format: Article in Journal/Newspaper
Language:English
Published: Czech Geological Survey 2018
Subjects:
QE Geology
Arctic
Digermulen
Norway
Stáhpogieddi
Online Access:https://eprints.keele.ac.uk/id/eprint/4965/
https://eprints.keele.ac.uk/id/eprint/4965/1/Jensen_etal_accepted_ms_Bulletin_of_Geosciences.pdf
http://www.geology.cz/bulletin/contents/art1685
https://doi.org/10.3140/bull.geosci.1685
Description
Summary:Scratch circles—bedding plane parallel sedimentary structures formed by the passive rotation of a tethered organism into the surrounding sediment—are relatively rare in the geological record. Here new occurrences of scratch circles are described from the Ediacaran–Cambrian Stáhpogieddi Formation, Digermulen Peninsula, Arctic Norway, and from the Ediacaran Nudaus and Urusis formations, Nama Group, of southern Africa. A literature survey confirms a previously noted concentration of scratch circles reported from shallow marine upper Ediacaran–lower Cambrian and paralic Carboniferous rocks. Scratch circle identification and nomenclature are discussed. The stratigraphical range of the trace fossils Treptichnus pedum and Gyrolithes isp. in the Stáhpogieddi Formation are extended downward. Combined with earlier reports of Harlaniella podolica this adds new precision to the placement of the Ediacaran–Cambrian boundary on the Digermulen Peninsula.

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