Acritarchs, spores and chitinozoans from the Middle Devonian, (Givetian), Rapid Member of the Cedar Valley Formation, Iowa, U.S.
Reference:
Wicander,R. et al. (1984)
Acritarchs, spores and chitinozoans from the Middle Devonian, (Givetian), Rapid Member of the Cedar Valley Formation, Iowa, U.S. American Association of Stratigraphic Palynologists,16th Annual Meeting,Program and Abstracts
P. 35- 35