The paleomagnetic measurement is used to identify two subtimes: Biwa reverse polarization No. 1 and Biwa reverse polarization No. 2, and also to identify the late Middle Pleistocene.

 
  • 沖洪積層中部的熱釋光年齡為 (30 2± 2 2 )ka ;古地磁測量確定出琵琶反向極性 1和琵琶反向極性 2兩個(gè)亞時(shí) ;時(shí)代為中更新世晚期 .
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