Re-evaluation of the conodont Iapetognathus and implications for the base of the Ordovician System GSSP
(2011) In Lethaia 45(2). p.227-237- Abstract
- In 2000, the International Union of Geological Sciences (IUGS) ratified the decision
from the International Working Group on the Cambrian–Ordovician Boundary (COBWG)
to place the Global boundary Stratotype Section and Point (GSSP) for the base of
the Ordovician System in the Green Point section, Newfoundland, Canada, at a point
coinciding with the first appearance of the conodont Iapetognathus fluctivagus. However,
a restudy of the conodont successions from Green Point shows that this species is not
present at the boundary interval, and as a consequence the section does not fulfil the biostratigraphical
requirements of a GSSP. The GSSP horizon as now defined is based on... (More) - In 2000, the International Union of Geological Sciences (IUGS) ratified the decision
from the International Working Group on the Cambrian–Ordovician Boundary (COBWG)
to place the Global boundary Stratotype Section and Point (GSSP) for the base of
the Ordovician System in the Green Point section, Newfoundland, Canada, at a point
coinciding with the first appearance of the conodont Iapetognathus fluctivagus. However,
a restudy of the conodont successions from Green Point shows that this species is not
present at the boundary interval, and as a consequence the section does not fulfil the biostratigraphical
requirements of a GSSP. The GSSP horizon as now defined is based on a
level part-way through the range of I. preaengensis – a species with lower first appearance
datum (FAD). The true FAD of I. fluctivagus is above the FAD of planktonic graptolites
and well above the FAD of I. preaengensis. As a consequence of these problems, a restudy
of the GSSP section and the other sections in the Cow Head Group is necessary. A redefinition
of the GSSP horizon is suggested. The following four alternative horizons have
potential as new horizons for the GSSP level: the FAD of Cordylodus intermedius; the
FAD of Cordylodus andresi; the FAD of Eoconodontus notchpeakensis; and the FAD of the
agnostoid Lotagnostus americanus. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4253225
- author
- Terfelt, Fredrik LU ; Bagnoli, Gabriella and Stouge, Svend
- organization
- publishing date
- 2011
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- global boundary stratotype section point, conodont, boundary, cambrian, Iapetognathus, ordovician
- in
- Lethaia
- volume
- 45
- issue
- 2
- pages
- 227 - 237
- publisher
- Taylor & Francis
- external identifiers
-
- scopus:84858217135
- ISSN
- 0024-1164
- DOI
- 10.1111/j.1502-3931.2011.00275.x
- language
- English
- LU publication?
- yes
- id
- 7faedc37-143f-4d0b-bc8c-b874178ee408 (old id 4253225)
- date added to LUP
- 2016-04-01 14:07:13
- date last changed
- 2022-04-06 08:51:34
@article{7faedc37-143f-4d0b-bc8c-b874178ee408,
abstract = {{In 2000, the International Union of Geological Sciences (IUGS) ratified the decision<br/><br>
from the International Working Group on the Cambrian–Ordovician Boundary (COBWG)<br/><br>
to place the Global boundary Stratotype Section and Point (GSSP) for the base of<br/><br>
the Ordovician System in the Green Point section, Newfoundland, Canada, at a point<br/><br>
coinciding with the first appearance of the conodont Iapetognathus fluctivagus. However,<br/><br>
a restudy of the conodont successions from Green Point shows that this species is not<br/><br>
present at the boundary interval, and as a consequence the section does not fulfil the biostratigraphical<br/><br>
requirements of a GSSP. The GSSP horizon as now defined is based on a<br/><br>
level part-way through the range of I. preaengensis – a species with lower first appearance<br/><br>
datum (FAD). The true FAD of I. fluctivagus is above the FAD of planktonic graptolites<br/><br>
and well above the FAD of I. preaengensis. As a consequence of these problems, a restudy<br/><br>
of the GSSP section and the other sections in the Cow Head Group is necessary. A redefinition<br/><br>
of the GSSP horizon is suggested. The following four alternative horizons have<br/><br>
potential as new horizons for the GSSP level: the FAD of Cordylodus intermedius; the<br/><br>
FAD of Cordylodus andresi; the FAD of Eoconodontus notchpeakensis; and the FAD of the<br/><br>
agnostoid Lotagnostus americanus.}},
author = {{Terfelt, Fredrik and Bagnoli, Gabriella and Stouge, Svend}},
issn = {{0024-1164}},
keywords = {{global boundary stratotype section point; conodont; boundary; cambrian; Iapetognathus; ordovician}},
language = {{eng}},
number = {{2}},
pages = {{227--237}},
publisher = {{Taylor & Francis}},
series = {{Lethaia}},
title = {{Re-evaluation of the conodont Iapetognathus and implications for the base of the Ordovician System GSSP}},
url = {{http://dx.doi.org/10.1111/j.1502-3931.2011.00275.x}},
doi = {{10.1111/j.1502-3931.2011.00275.x}},
volume = {{45}},
year = {{2011}},
}