Ancient sedimentary layers reveal secrets of Lanzhou-Minhe Basin's evolution.
The Early Cretaceous Hekou Group in Lanzhou-Minhe Basin is made up of thick terrestrial sediments. It can be divided into eight formations, showing different types of sediment like alluvial fan, delta, and shallow lake. The basin went through three phases: alluvial fan, delta, and shallow lake, reflecting its development over time.