Which type of microfossils have tests (hard parts)made of calcium carbonate and are useful as index fossils as well as for measuring past sea temperatures and climates since the Cretaceous?
A)acritarchs and dinoflagellates
B)coccoliths and formaminifera
C)conodonts
D)diatoms and radiolaria

Question

Quizplus · Accepted Answer

Coccoliths and foraminifera are the two types of microfossils that have tests made of calcium carbonate. They are useful as index fossils and for measuring past sea temperatures and climates since the Cretaceous period.

Which Type of Microfossils Have Tests (Hard Parts)made of Calcium