Coccolith

the Coccolithen are microscopic (maximally 0.01 mm large) disk-shaped panels from lime, which form the bowl of the Coccolithophoriden. This rock is also the name giver for the earth-history time period of the chalk is called.

Coccolithenschlamm designates deep sea - a lime mud , which consists of Coccolithen in geology. These sat during lifetimes on the spherical gelatinous bodies of planktonischer Flagellaten (Coccolithophorida). The white chalk rock of Rügen consist to a large part of fossil Coccolithen. Write chalk consists of Coccolithen.