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Additional
Tiaojishan Formation
English Wikipedia - The Free Encyclopedia
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Tiaojishan Formation
The
Tiaojishan Formation
is a
geological formation
in
Hebei
and
Liaoning
,
People's Republic of China
, dating to the middle-
late Jurassic
period (
Bathonian
-
Oxfordian
stages). It is known for its
fossil plant
s, and is made up mainly of
pyroclastic rock
interspersed with basic volcanic and
sedimentary rocks
. Previously, the Tiaojishan Formation was grouped together with the underlying
Haifanggou Formation
(also known as the Jiulongshan Formation) as a single "
Lanqui Formation
." Most researchers now agree that the
Daohugou Bed
, of formerly controversial dating, is a part of the Tiaojishan formation.
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