New evidence for Cretaceous age of the feathered dinosaurs of Liaoning: zircon U-Pb SHRIMP dating of the Yixian Formation in Sihetun, northeast China
We present the first report of U-Pb SHRIMP dating of zircons from three tuffs interbedded
within the “feathered dinosaur”-bearing deposits in western Liaoning, China. One is a
sample from the Bed 6 tuff (LX-SHT-12) of the Yixian Formation in Sihetun, for which our
zircon U-Pb SHRIMP analyses gave a Cretaceous age (124.7�2.7 Ma), in agreement with a
previously published sanidine 40Ar/39Ar age (124.60�0.25 Ma). The other two are from the
Bed 1 tuff (LX-HBJ-1) and Bed 8 tuff (LX-HBJ-6) of the Yixian Formation in Huangbanjigou;�…
within the “feathered dinosaur”-bearing deposits in western Liaoning, China. One is a
sample from the Bed 6 tuff (LX-SHT-12) of the Yixian Formation in Sihetun, for which our
zircon U-Pb SHRIMP analyses gave a Cretaceous age (124.7�2.7 Ma), in agreement with a
previously published sanidine 40Ar/39Ar age (124.60�0.25 Ma). The other two are from the
Bed 1 tuff (LX-HBJ-1) and Bed 8 tuff (LX-HBJ-6) of the Yixian Formation in Huangbanjigou;�…
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