Maritime tropical, continental tropical, maritime polar, and continental polar
There are numerous factors. It mostly relies on rough winds coming from all sides and clashing over Japan, mixed with the humid area and heavily clouds that come from the pacific ocean, and also both air and water currents. Everything about Japan's geographic position is great for Monsoons, Typhoons, Earthquakes, and numerous other disasters.
Sedimentary rocks can contain fossils because, unlike most igneous and metamorphic rocks, they form at temperatures and pressures that do not destroy fossil remains.