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Mixed topostratic unit
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A topostratic unit with the lower boundary based on lithologic data and the upper boundary based on paleontologic data, or vice versa (henningsmoen, 1961, p. 74).
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Lithologic, английский
(adjective) pertaining to the physical character of a rock. hp
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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).
Mesothem, английский
A time-significant stratigraphic unit forming major cycles o f deposition which are normally bounded above and below by unconformities on shelf areas, but which have their limits defined by marker points at the bases o f chronozones in continuously deposited sediments in basins (ramsbottom, 1977, p. 282; 1978, p. 307).
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