Palaeomagnetism of A Core Sediment From the Inland Sea, Japan (Seto Naikai)

Palaeomagnetic measurements on a giant core sample 20 cm in diameter and 7.38 m long collected from Mizushima-Nada, the Inland Sea. Japan (Seto Naikai) provide evidence of post-depositional magnetization. the geomagnetic secular variation from about 4000 to 8000 yr BP is characterized by a long period of westerly declination before 6600 yr BP. the maximum deflection is beyond 50°W during this period. the palaeomagnetic record further demonstrates that there is a hiatus over 3000 yr in sedimentation due 10 the sea-level change around 6.85 m from sea bottom, and that the lower limit of the sea-level around 8000 yr BP is 18.5 m beneath the present sea-level.