Foraminifera

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Fo·ram·i·nif·e·ra

(fō-ram'i-nif'ĕr-ă, for'ă-mi-nif'er-ă),

A subclass of Rhizopoda possessing anastomosing pseudopodia; these form a network around the cell that usually develops into a complex calcareous shell; an important component of the ocean bottom and of rockbeds overlying oil deposits.

[L. foramen, aperture, + fero, to carry]

Foraminifera

amoeboid PROTOZOANS that possess chitinous, calcareous or siliceous shells that are usually many-chambered. Calcareous Foraminifera are the main constituent of chalk.

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They started with modern stromatolites and added the kinds of forams that are found in thrombolites.

In drug-free samples, where forams could use pseudopods, the fine layers had changed to jumbled arrangements similar to those seen in thrombolites.

What doomed the stromatolites? Scientists find key clue to ancient enigma

They could do that by meeting in person or by sending around micrographs of the disputed forams. Although either method involves considerable work, "it looks like we have to do that," says Ginsburg.

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