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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract


Pub. Id: A116 (1978)

First Page: 337

Last Page: 339

Book Title: SG 6: Contributions to the Geologic Time Scale

Article/Chapter: Devonian

Subject Group: Geologic History and Areal Geology

Spec. Pub. Type: Studies in Geology

Pub. Year: 1978

Author(s): Willi Ziegler (2)

Abstract:

Evaluation of time and correlation work within the Devonian suffer greatly from the lack of internationally agreed upon boundaries. The only boundary of the whole system which has been internationally agreed upon is its lower boundary--an excellent example of a precisely defined boundary based on biochronologic evidence. The IUGS Subcommission on the Silurian-Devonian Boundary which defined it suggested this boundary (the stratotype of which is in Czechslovakia) to be within a time span of between 100,000 to 300,000 years, as estimated from biologic evidence.

There is no absolute dating in the Devonian that could compete with such a highly precise biochronologic date. The range of error of any published absolute data is many times larger than the time span represented by this lower boundary of the Devonian.

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