Ss. Wang et al., The existing time of Sihetun vertebrate in western Liaoning, China - Evidence from U-Pb dating of zircon, CHIN SCI B, 46(9), 2001, pp. 779-782
In different opinions, the stratigraphic time of the feathered dinosaurs an
d early birds in Sihetun and its neighboring areas in Beipiao, western Liao
ning is appointed to different epoches of eras, such as Late Jurassic, Earl
y Cretaceous and Late Jurassic-Early Cretaceous. Even the recently dating d
ata are still very different. This note first reported the U-Pb age of (125
.2 +/- 0.9) Ma of zircon separated from tuff of Sihetun vertebrates horizon
. The age reveals that Sihetun vertebrate belongs to Early Cretaceous. The
method is more objective, because of the strong ability of disturbance resi
stance and high U-Pb blocking temperature of zircons.