Correlation of the Cambrian Evolutionary Radiation: geochronology, evolutionary stasis of earliest Cambrian (Terreneuvian) small shelly fossil (SSF) taxa, and chronostratigraphic significance

Early faunas with Watsonella crosbyi with or without Aldanella spp. have been equated with the Siberian Tommotian Stage (uppermost Terreneuvian) and used to define a proposed Cambrian Stage 2 base. Much earlier Terreneuvian occurrences are now shown by recovery of these micromolluscs below the I’ ca...

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Bibliographic Details
Published in:Geological magazine 2016-07, Vol.153 (4), p.750-756
Main Authors: LANDING, ED, KOUCHINSKY, ARTEM
Format: Article
Language:English
Subjects:
adaptive radiation
Aldanella
assemblages
Avalonia
biologic evolution
biostratigraphy
C-13/C-12
Cambrian
Canada
carbon
Chapel Island Formation
chronostratigraphy
correlation
Eastern Canada
Fossils
geochemistry
Geological time
Invertebrata
invertebrate
isotope ratios
isotopes
Lower Cambrian
migration
Newfoundland
Newfoundland and Labrador
paleoecology
paleoenvironment
Paleontology
Paleozoic
problematic fossils
shells
stable isotopes
Stratigraphy
Terreneuvian
Watsonella
Watsonella crosbyi
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Summary:Early faunas with Watsonella crosbyi with or without Aldanella spp. have been equated with the Siberian Tommotian Stage (uppermost Terreneuvian) and used to define a proposed Cambrian Stage 2 base. Much earlier Terreneuvian occurrences are now shown by recovery of these micromolluscs below the I’ carbon excursion in the Siberian ‘Nemakit-Daldynian’ Stage and comparable δ13C excursions in the middle Meishucunian (China) and middle Chapel Island Formation (Avalonia). This δ13C excursion, a reliable Stage 2 marker, lies in a c. 10 Ma interval in the Cambrian Radiation in which long-ranged small shelly fossil taxa provide limited biostratigraphic resolution.
ISSN:0016-7568
1469-5081
DOI:10.1017/S0016756815001089