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2018 (English)In: Bulletin of Geosciences, ISSN 1214-1119, E-ISSN 1802-8225, Vol. 93, no 3, p. 287-304Article, review/survey (Refereed) Published
Abstract [en]
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 Stahpogieddi 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 Stahpogieddi 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.
Place, publisher, year, edition, pages
CZECH GEOLOGICAL SURVEY, 2018
Keywords
scratch circles, Ediacaran, Cambrian, Norway, Republic of South Africa, Namibia, trace fossils
National Category
Other Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-363891 (URN)10.3140/bull.geosci.1685 (DOI)000441904600002 ()
2018-11-122018-11-122018-11-12Bibliographically approved