The applications of various isotope-dating techniques have indicated that the Jehol Biota belongs to the Early Cretaceous, living on earth for around 20 million years.
The applications of various isotope-dating techniques have indicated that the Jehol Biota belongs to the Early Cretaceous, living on earth for around 20 million years.
同位素测年技术的广泛应用，表明热河生物群属于早白垩世，在地球上延续了大约2千万年。