9th International Symposium on the Ordovician System, 7th International Graptolite Conference & Field Meeting of the International Subcommission on Silurian Stratigraphy

摘要

The "9th International Symposium on the Ordovician System, 7th International Graptolite Conference & Field Meeting of the International Subcommission on Silurian Stratigraphy" commenced on August 12, 2003, by receiving in San Juan City to all participants of the pre-symposia field trip through the Precordillera of Mendoza and San Juan provinces, western Argentina. On August 13, the field trip began with the purpose to show significant Lower Paleozoic outcrops from diverse settings of the Precordillera geological province. This five-days excursion was led by Drs. S. H. Peralta, G. Ortega, S. Heredia, F. Canas, G. L. Albanesi, M. S. Beresi and M. Carrera (from diverse universities and research centers of Argentina), who introduced and explained different aspects of Ordovician and Silurian geology and paleontology of the basin. On the first day, the attendance was driven to the Province of Mendoza to visit the San Isidro locality, at the foothill of the Precordillera, where the Middle-Upper Ordovician Empozada Formation is exposed. Interesting discussions on the deep-water facies, either black shales or intervals including olistostromes and olistoliths, were held for further interpretations on sequence stratigraphy. Besides, new paleontological records, particularly dealing with graptolite and con-odont zones, were presented.