As I presented a poster about these things at Them Micropalaeontological Society AGM today here are just two examples of the 40+ species in the coccolithophore Blackites genus - a calcareous nannofossil that existed from the latest Palaeocene (we think) to the end of the Palaeogene. The two photos show Blackites deflandrei on the left and Blackites morionum on the right. Both are from Tanzanian Middle Eocene samples.
Source: micromademacro












