They can just go to places like the Grand Canyon if they want to see old rock layers.
Google AI search results: They are about 1.84 billion years old. The youngest rock layers, forming the canyon’s rim, are about 270 million years old
https://en.wikipedia.org/wiki/Geology_of_the_Grand_Canyon_area
The commies have plenty of Cretaceous rocks. They don’t have to drill so deep. I guess they have NGO’s too and waste lots of money.
Google: Cretaceous rocks are found where in china
FTA: the team is aiming to pass through more than 10 layers of continental rock and reach the Cretaceous geological system, dating back 145 million years.
Sounds like the beginning of a low grade sci-fi movie...