For cryptotephra detection, data from 419 volcanic glass shards in the deposits from the top of the core to a depth of 9.5 cm from the MD01-2421 core collected off the Kashima coast, East Japan were obtained and divided into seven clusters. The basaltic cluster, andesitic cluster and some volcanic glass shards in the dacitic cluster might be correlated to the Fuji Hoei (F-Ho) tephra that erupted from Mt. Fuji in 1707 AD. A dacitic cluster might include volcanic glass shards originating from another dacitic source magma in addition to Asama A (As-A) tephra erupting from Mt. Asama in 1783 AD and F-Ho tephra.