The Cretaceous is an intraplate-rifting stage, characterized by representative geological elements such as AA-type granite, red down-faulted basins, bimodal subvolcanic rocks and basic volcanic rocks.

• 白垩纪为陆内裂谷阶段，形成的代表性地质要素有AA型花岗岩、大量陆相红色断陷盆地、基性火山岩、双峰式次火山岩等。