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[[file:applied-paleontology_fig17-1.png|300px|thumb|{{figure number|1}}Typical calcareous foraminifera.]]

[[file:applied-paleontology_fig17-1.png|300px|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.

Some stratigraphically important foraminifera developed complex internal structures and, frequently, large test size. Studied primarily in thin section, these include the fusulinids (Pennsylvanian to Permian) and several groups of so-called larger foraminifera (Triassic to Holocene). They occur primarily in carbonate or fine-grained clastic rocks and are excellent time markers.

Some stratigraphically important foraminifera developed complex internal structures and, frequently, large test size. Studied primarily in thin section, these include the fusulinids (Pennsylvanian to Permian) and several groups of so-called larger foraminifera (Triassic to Holocene). They occur primarily in carbonate or fine-grained clastic rocks and are excellent time markers.

[[Category:Predicting the occurrence of oil and gas traps]]  

[[Category:Predicting the occurrence of oil and gas traps]]  

[[Category:Applied paleontology]]

[[Category:Applied paleontology]]