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~(40)Ar/~(39)Ar dating of ignimbrite from Inner Mongolia,northeastern China,indicates a post-Middle Jurassic age for the overlying Daohugou Bed

A.Boven

  [1]The ~(40)Ar/~(39)Ar step heating analyses of K-feldspar derived from the ignimbrite in Inner Mongolia,China indicates that they were formed at 159.8±0.8 Ma,which provides a maximum age for the overlying fossilbearing lacustrine deposits(Daohugou Bed).This result favors a post-Middle Jurassic(Late Jurassic or younger), rather than the Middle Jurassic age for the Daohugou Bed. Such a result is generally consistent with vertebrate biostratigraphic evidence,providing a maximum known……