Abstract
The granite erosional basins are well developed in South Korea, where granite covers a dominant portion of the geology and alluvial fans and fanlike terraces are well developed in the erosional basin. This study analyzed the geomorphological formation ages of 12 selected alluvial fans and fanlike terraces developed in 9 granite erosional basins in South Korea. As a result, it is estimated that alluvial fans formed ca. ~10ka, 30ka, 50ka, 75ka, and 90ka. Therefore, it is estimated that the return period of paleo-flood, which is a formation factor of alluvial fans, was approximately 25,000 to 30,000 years during the Late Quaternary.
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