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геологический ярусcontraintes
constr. layer of geology
expl. horizon
géol. stage (MichaelBurov); geologic stage (MichaelBurov); geochronological stage (MichaelBurov); stratigraphic stage (MichaelBurov); geological stage (Technically, a stage is a succession of rock strata laid down in a single age on the geologic timescale.: Толща горных пород, образовавшуюся в течение одного геологического века MichaelBurov)
pétr. floor (Johnny Bravo)