As he explains, the Geologic Time Scale is largely based on the stratigraphic record.
他解释说，地质时间尺度很大程度上基于对地层的记录。
2
Geologic time unit, rock stratigraphic units and timestratigraphic unit.
地质年代单位、岩石地层单位、年代地层单位。
3
The result provides a foundation of exact time for the high precision stratigraphic subdivision and coal-forming period in Eastern Heilongjiang Province.