GRAPTOLITE EVIDENCE FOR THE AGES OF THE SOFALA VOLCANICS AND WILLOW-GLEN FORMATION, NORTHERN CAPERTEE-HIGH, NSW

Authors
RICKARDS RB WRIGHT AJ PEMBERTON JW
Citation
Rb. Rickards et al., GRAPTOLITE EVIDENCE FOR THE AGES OF THE SOFALA VOLCANICS AND WILLOW-GLEN FORMATION, NORTHERN CAPERTEE-HIGH, NSW, Alcheringa, 22(3-4), 1998, pp. 223-230
Citations number
30
Categorie Soggetti
Paleontology
Journal title
Alcheringa → ACNP
ISSN journal
03115518
Volume
22
Issue
3-4
Year of publication
1998
Pages
223 - 230
Database
ISI
SICI code
0311-5518(1998)22:3-4<223:GEFTAO>2.0.ZU;2-S
Abstract
New finds of graptolites in the Cudgegong district N.S.W., indicate a Bo3 (mid-Bolindian: Late Ordovician) age for the upper part of the Sof ala Volcanics and an early Pridoli (Late Silurian) age for the upper p art of the Willow Glen Formation. The Silurian graptolite is described as Monograptus parultimus minutus subsp. nov. Integration of the new biostratigraphic data with SHRIMP ages for volcanic units in the Cudge gong sequence supports an age of 410 Ma for the Silurian-Devonian boun dary.