Lithostratigraphy and biostratigraphy of the Campanian-Maastrichtian Toyajo Formation in Wakayama, southwestern Japan

The Toyajo Formation is similar to the Izumi Group in various geologic features, and may indicate that the Toyajo Formation was deposited in a strike-slip basin along the Chichibu Belt formed by the movement along the Kurosegawa Tectonic Zone in the latest Cretaceous, like the Izumi Group, along the Median Tectonic Line.