Mathematics – Logic
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3120609h&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 20, CiteID L20609
Mathematics
Logic
4
Geochemistry: Geochronology, Volcanology: Ash Deposits, Information Related To Geographic Region: Asia, Information Related To Geologic Time: Mesozoic
Scientific paper
The 40Ar/39Ar 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 fossil-bearing 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 age for the first appearance of several major animal groups such as Cryptobranchidae of Urodela (salamanders) and Maniraptora (birds and their closest dinosaurian relatives).
Boven A.
Ding Xiaohua
He Hui-Yong
Jin Fengping
Wang Faming
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