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Institute,
Warsaw, and to present technical papers. Some examples of
papers presented include those by Hanke and Wilson and by
Wilson and Hanke on a diverse assemblage of
acanthodian-like chondrichthyans and chondrichthyan-like
acanthodians from the Lochkovian MOTH locality in
northern Canada. Karatajute-Talimaa and Mertiniene
summarized morphogenetic types of chondrichthyan scales
as recognized in Devonian and Carboniferous deposits.
Papers on undoubted Devonian chondrichthyans were
presented by M. Williams, K. Trinajstic, and C. Derycke,
and on Late Palaeozoic chondrichthyans by A. Ivanov, R.
Soler-Gijón, O. Hampe, and G. Johnson.
New
Working Group:
Early and Middle Palaeozoic
Basins in the Circum-Arctic Region: Palaeotectonics and
Palaeogeography
The proposal
byV.V. Menner and P.
Männik to organize a new working group with the
above
titlewas
approved by IGCP 406 at its business meeting. The new
working group's objective is to give special attention to
comparative analysis of data from different parts of the
Circum-Arctic region, with the aim of reconstructing the
palaeogeographical situation, and to evaluating and
improving palaeotectonic reconstructions.
The group will focus studies in the
following directions:
1. Improvement of global
correlations of Silurian and Devonian sequences (based on
detailed studies of
some selected intervals,
particularly of the series boundaries).
2. Comparative analysis
of the evolution of the Silurian and Devonian sedimentary
basins in Canada,
Greenland, NE Europe
(Timan-Pechora region) and the northern part of Central
Siberia.
3. Comparison of
associations of Silurian and Devonian faunas
(brachiopods, ostracodes, conodonts,
vertebrates, etc.) from
different palaeobasins in the Circum-Arctic region.
4. Improvement
ofbiogeographical
subdivision of the studied regions.
5. Evaluation and
improvement of palaeotectonic reconstructions.
A more detailed program for the new
working group is found as an appendix to the project
Annual Report for 1998.
Publications
and Follow-Up:
Extended abstracts for the papers
presented at the meeting were published in the conference
proceedings volume, Ichthyolith Issues Special
Publication 4,pp.
1-62. A field guide (Skompski, 1998) was also compiled
for the conference field excursion. Many of the studies
reported at the meeting and workshops will be more
completely published by the participants in separate
papers and monographs.
Two special volumes (mentioned
above) are also planned: one on the palaeontology of
Severnaya Zemlya, to be published in Paris by
Geodiversitas, and the other as a special issue of
Acta Geologica Polonica. Numerous manuscripts have
been received for both volumes and many of them are now
in review. As mentioned above in connection with the
Timan-Pechora Workshop, plans are also in place to
publish papers on Timan-Pechora geology, in English, in
Proceedings of the Estonian
Academy of Sciences, Geology Series).
The next Annual Meeting of IGCP 406
will be in September 1999, in connection with the Baltic
Stratigraphical Association in Riga, Latvia. Meetings for
2000, the final year of the project, include a workshop
in association with the Early Vertebrates meeting in
Flagstaff, Arizona, together with field excursions to the
Ordovician and Devonian of Colorado and Utah, and the
final Annual Meeting of IGCP 406 to be held in Syktyvkar,
Russia, which will include a field excursion to the
Ordovian through Carboniferous of the subpolar
Urals.
Seventh
International Conodont Symposium (ECOS VII),
Bologna-Modena, June 18-22,
1998
ECOS VII was devoted to all aspects of conodont
studies (paleobiology, palaeoecology, taxonomy,
biostratigraphy, mineralogy, geochemistry etc.). The
Symposium was attended by more than 100 specialists all
over the world. Some 55 lectures were given and 47
posters presented. Two excursions - a pre-conference
excursion to Sardinia to study Lower and Middle
Palaeozoic sections, and a post-conference excursion to
the Southern Alps to visit several Ordovician, Devonian,
Carboniferous and Triassic sections, were
organized.
IGCP 406 was represented in ECOS
VII by A. Yudina, P. Männik and T. Nemirovskaya.
They all presented papers (see Abstracts in references).
A. Yudina (together with N. Savage) reported about the
results of the most recent studies of the upper Devonian
conodonts from various biofacies from the Timan-Pechora
Basin. Detailed comparisons of conodont associations and
sedimentological data allowed them to conclude that "the
variety of conodont biofacies in this well-studied basin
enhances their usefulness as Frasnian and Famennian
reference faunas." P. Männik presented his results
of studies of the evolution of the Telychian conodont
faunas. Re-study and revision of collections from several
regions all over the world allowed recognition of the
main evolutionary trends and considerable improvement in
the conodont biozonation for this interval. Also, during
ECOS VII he had the opportunity to show some conodonts
from Severnaya Zemlya and the Canadian
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