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System-group
| Словарь стратиграфических терминов |
A unit o f the highest rank in the category o f lithostratigraphic units (h. wang, 1966).
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Geochronologic unit, английский
A unit of geologic time (see sections 2.d, 3.a.11, and 9. a).
Diachronic unit, английский
A unit o f geologic time that comprises the unequal spans o f time represented either by a specific lithostratigraphic, allostratigraphic, biostratigraphic, or pedostratigraphic unit, or by an assemblage o f such units (north american stratigraphic code, 1983, p. 870).
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