Global Stratotype Section and Point for base of the Ordovician System

R. A. Cooper; G. S. Nowlan; S. H. Williams

doi:10.18814/epiiugs/2001/v24i1/005

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Episodes 2001; 24(1): 19-28

Published online March 1, 2001

https://doi.org/10.18814/epiiugs/2001/v24i1/005

Global Stratotype Section and Point for base of the Ordovician System

R. A. Cooper¹, G. S. Nowlan², S. H. Williams³

¹Institute of Geological and Nuclear Sciences, P.O. Box 30368, Lower Hutt, New Zealand.
²Geological Survey of Canada, 3303 - 33rd Street N.W., Calgary, Alberta, Canada T2L 2A7.
³Department of Earth Sciences, Memorial University of Newfoundland, St. John’s, Newfoundland, Canada A1B 3X5.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The Global Stratotype Section and Point for base of the Ordovician System and base of the lowest Ordovician stage (Tremadocian) is exposed in the coastal platform at Green Point, western Newfoundland, at the 101.8 m level, within Bed 23, in the measured section (Lower Broom Point Member, Green Point Formation), coinciding with the first appearance of the conodont Iapetognathus fluctivagus Nicoll, Miller, Nowlan, Repetski and Ethington, 1999, and 4.8 m below the earliest planktic graptolites.