The Ediacaran Period: a new addition to the geologic time scale

Publication Type  Journal Article
Year of Publication  2006
Authors  Knoll, A. H.; Walter, M. R.; Narbonne, G. M.; Christie-Blick, N.
Journal Title  Lethaia
Volume  39
Issue  1
Pages  13-30
Journal Date  Mar
ISBN Number  0024-1164
Accession Number  ISI:000237162400002
Key Words  ediacaran; geologic time scale; global stratotype section and point; proterozoic; neoproterozoic doushantuo formation; late precambrian shales; south-australia; northwestern canada; marinoan glaciation; snowball earth; mackenzie mountains; acraman impact;

The International Union of Geological Sciences has approved a new addition to the geologic time scale: the Ediacaran Period. The Ediacaran is the first Proterozoic period to be recognized on the basis of chronostratigraphic criteria and the first internationally ratified, chronostratigraphically defined period of any age to be introduced in more than a century. In accordance with procedures established by the International Commission on Stratigraphy, the base of the Ediacaran Period is defined by a Global Stratotype Section and Point (GSSP) placed at the base of the Nuccaleena Formation cap carbonate directly above glacial diamictites and associated facies at Enorama Creek in the Flinders Ranges of South Australia. Its top is defined by the initial GSSP of the Cambrian Period. The new Ediacaran Period encompasses a distinctive interval of Earth history that is bounded both above and below by equally distinctive intervals. Both chemostratigraphic and biostratigraphic data indicate that the subdivision of the period into two or more series is feasible, and this should be a primary objective of continuing work by the Ediacaran Subcommission of the ICS.


037QQTimes Cited:16Cited References Count:118

URL  <Go to ISI>://000237162400002
DOI  Doi 10.1080/00241160500409223