Tigang dasa yuta sané jagi rauh (310 Ma) ngenenin pabinayan sinapsida (rumasuk ring mamalia) saking sauropsida (rumasuk ring soroh paksi miwah reptil).
Another 30 million years (310 Ma[30]:254-256) saw the divergence of the synapsids (including mammals) from the sauropsids (including birds and reptiles).