Dating of sedimentary rock intervals using visual comparison of carbon isotope records: a comment on the recent paper by Bergström et al. concerning the age of the Winneshiek Shale. (16th January 2019)

• Record Type: Journal Article
• Authors: Lindskog, Anders; Young, Seth A.
• Is Part Of: Lethaia. Volume 52:Number 3(2019)
• Page Start: 299
• Page End: 303
• Publication Date: 2019-01-16
• Subjects: δ13C -- chemostratigraphy -- correlation -- Decorah impact crater -- Ordovician -- Whiterockian; Paleontology -- Periodicals; Geology, Stratigraphic -- Periodicals; 560
• DOI: 10.1111/let.12316
• Languages: English
• ISSNs: 0024-1164

Abstract

Abstract : The recently published Lethaia paper by Bergström et al . (https://doi.org/10.1111/let.12269 ) on the age of the Ordovician Winneshiek Shale (Iowa, USA), and the impact that formed the Decorah crater which hosts this rock unit, is an interesting scientific contribution, although there are a number of problems with the interpretations and data presentation that merit comment. Due mainly to a lack of adequate critical assessment of δ 13 C data and biostratigraphical control, we contend that the conclusions of Bergström et al . are poorly founded and should not be cursorily accepted and propagated in future scientific literature.