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→Zone distinctions
| Marine
| Marine
* Neritic (continental shelf) * Bathyal (continental slope) * Abyssal (sea floor)
* Neritic (continental shelf)
* Bathyal (continental slope)
* Abyssal (sea floor)
| Characteristic benthic foraminiferal faunas; in general, planktonic organisms increase in relative abundance with depth and distance from shore and usually dominate fossil populations in pelagic environments.
| Characteristic benthic foraminiferal faunas; in general, planktonic organisms increase in relative abundance with depth and distance from shore and usually dominate fossil populations in pelagic environments.