Abstract Geomagnetic excursions represent the dynamic nature of geodynamo. Accumulated palaeomagnetic records indicate that such are dominated by dipolar-fields, but exhibit different structures. Here we report a record from varved sediments Lake Suigetsu, central Japan, which reveals fine structures in Laschamp Excursion and new post-Laschamp excursion coincides with Δ 14 C maxima. The record’...