On the other hand, a new species of fossil ammonite which is approximately 220 million years old was found in Nukata, Yakuno-cho located outside the Fukuchiyama Basin.
一方、福知山盆地外にあたる夜久野町額田（ぬかた）からは約2億2千万年前の新種のアンモナイトの化石が出土している。