Tricolpate pollen grains from a Cretaceous joint filling in the Devonian Massenkalk in the eastern Sauerland, Nortrine-Westphalia, Federal Republic of Germany.
Reference:
Grebe,H. (1978)
Tricolpate pollen grains from a Cretaceous joint filling in the Devonian Massenkalk in the eastern Sauerland, Nortrine-Westphalia, Federal Republic of Germany. Journal of Palynology
Vol. 14 # 1 P. 50- 58