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21.3 Supergroup SAR -- Part 3
There is a layer of dead foraminiferans and radiolarians on the ocean floor.
The presence of tests is used as an indicator of oil deposits.
Their fossils are evidence of the antiquity of the protists.
Each geological period has a distinctive form of foraminiferan; thus, foraminiferans can be used as index fossils.
There were millions of years of foraminiferan deposits along the southern coast of England.
The great Egyptian pyramids are made of foraminiferan limestone.
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