Alsophila spinulosa, a plant of the same age as dinosaurs, was found in the primeval forest at the bottom of Dashiwei, the largest Tiankeng in Leye Tiankeng
Alsophila spinulosa was not found in other Leye Tiankeng.
 Some people speculated that Dashiwei should have been formed in the dinosaur era, that is, 65 million years ago