First appearance of selected Early Ordovician acritarch taxa from Peri-Gondwana.
Reference:
Brocke,R. et al. (1995)
First appearance of selected Early Ordovician acritarch taxa from Peri-Gondwana. The Pacific Section of the Society for Sedimentary Geology (SEPM), Fullerton, California, Book 77. (Ordovician Odyssey: Short Papers for the Seventh International Symposium on the Ordovician System. J. D. Cooper et al,editors).
# 77 P. 473- 476