This paper is an attempt to analyze the meaning of the basic concepts of stratigraphy, space, locality, material things, time, events, simultaneity, succession, correlation, geological time-table, geological key-events, relationship between stratigraphy and paleontology, zones, stages, 'time-rock units', and 'time-units'. Physical stratigraphy is a science that deals with the spatial relationship of material things; historical stratigraphy deals with the spatial and temporal relationships of events.

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