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→Calcareous nannofossils
==Calcareous nannofossils==
==Calcareous nannofossils==
[[file:applied-paleontology_fig17-3.png|left|thumb|{{figure number|3}}Typical calcareous nannofossils.]]
[[file:applied-paleontology_fig17-3.png|300px|thumb|{{figure number|3}}Typical calcareous nannofossils.]]
The term ''calcareous nannofossils'' includes both fossil coccoliths and nannoliths. '''Coccoliths''' are minute (<25μm) calcite objects produced by unicellular marine plants (golden-brown algae). The origin of nannoliths is uncertain, but these calcite bodies are associated with fossil coccoliths assemblages in marine sediments and are also organically derived.
The term ''calcareous nannofossils'' includes both fossil coccoliths and nannoliths. '''Coccoliths''' are minute (<25μm) calcite objects produced by unicellular marine plants (golden-brown algae). The origin of nannoliths is uncertain, but these calcite bodies are associated with fossil coccoliths assemblages in marine sediments and are also organically derived.