Showcase: Microfossil showcase
Size: < 0.01 mm
Coccolithophores are unicellular planctonic protists with photosynthetic pigments. Tiny calcareous scales called
coccoliths ( (0.003-0.015 across) form around these cells a protective armour which falls apart when the organism dies. The Cretaceous and Tertiary
"chalks" are formed of almost 100% coccoliths.