Elucidation of depositional sequence development detected within one hundred years

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Holocene relative sea-level changes have been reconstructed by using the relationship between carbon isotope ages of sample and/or depths of occurrence. The Japanese Holocene successions are interpreted to represent a depositional sequence. Temporal changes of depositional rate also can be obtained for the Holocene. A smoothed curve on the diagram of age versus elevation, called "depositional curve". represents an space and time trajectory of "sea-floor" during the period of deposition. The paleo-depth also can be deciphered using by the depositional curve and relative sea-level curve.The depositional curves characterize temporal patterns in a wide range of depositional systems, such as, delta, beach-shoreface, bay, barrier, fluvial, lake and foreland-basin. The depositional curves for different types of depositional systems appear to be important new data for the sequence-stratigraphic analysis of older deposits. The major reason is that these curves show quantative variations in depositional speed during a transgressive-and-regressive cycle in different types of depositional systems.