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==Calcareous foraminifera==

==Calcareous foraminifera==

[[file:applied-paleontology_fig17-1.png|left|thumb|{{figure number|1}}See text for explanation.]]

[[file:applied-paleontology_fig17-1.png|left|thumb|{{figure number|1}}Typical calcareous foraminifera.]]

Calcareous foraminifera are a group of unicellular organisms (protists) that secrete a rigid calcite or aragonite shell (or test). Fossils of these forms are found in sediments of brackish to marine origin from Silurian to Holocene in age. Most are benthic (bottom dwelling), but a significant group in the late Mesozoic and Cenozoic are planktonic (floating) forms.

Calcareous foraminifera are a group of unicellular organisms (protists) that secrete a rigid calcite or aragonite shell (or test). Fossils of these forms are found in sediments of brackish to marine origin from Silurian to Holocene in age. Most are benthic (bottom dwelling), but a significant group in the late Mesozoic and Cenozoic are planktonic (floating) forms.