Foraminiferan shells. Light micrograph of assorted shells of fossil species belonging to the order: Foraminifera. Single-celled protozoans once inhabited these shells which are composed of several chambers and usually penetrated by pores. The organisms lived in the sea or salt-water lakes,as do present day forms. Foraminiferan shells form an important component of chalk and of many deep sea oozes. In previous geological ages Foraminifera occurred in such enormous numbers that their shells,as here,largely composed of calcium carbonate,formed immense fossil deposits seen today as limestone. Magnification: x50 at 6x6cm size | |
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