Biostratigraphy and paleoecology of the famous dinosaur beds of Tendaguru Formation, Tanzania, East Africa are still under discussion. Calcareous microfossils have not yet contributed to this question . Four samples from the Middle Dinosaur Member have now yielded charophyte gyrogonites of the species Aclistochara c£ bransonii, Aclistochara cf. minor, Mesochara canellata, and Mesochara harrisi....