Holocene sea-level changes on the east coast of Korea Peninsula are discussed based on sedimentary facies of alluvium and their radiocarbon ages. Minor fluctuations of the sea-level are restored by grain size analysis of alluvial deposits from 10, 000y. B. P., and by pollen analysis of peaty deposits since 6, 000y. B. P..
Main results are as follows ;
1. Sea-level was about -25m a. s. 1, around 10, 000y. B. P. and it rose to about -10m a. s. 1, around 7, 000y. B. P.. The sea nearly attained to its present level around 6000y. B. P., and has approximately stood at the same level with minor fluctuations since then.
2. As the sea-level curve obtained from the study area resembles to those from many other parts of the world in its altitudes and ages, the existance of active crustal movements during Holocene are discarded on the east coast of the Peninsula.
3. Gravel bed was deposited about -20m a. s. 1. in Pohang plain at the time of temporary stable sea-level recorded between 10, 000y. B. P. and 9, 000y. B. P. during the period of rapid transgression.
4. During the period of stable sea-level since 6, 000y. B. P., beach ridges have been formed at the time of three comparatively high levels.