in Jurassic and Cretaceous Stratigraphy

Earth Science Frontiers, Vol. 17, Special Issue, Aug. 2010 ISSN 1005-2321
nodules (occasionally fossiliferous).
est. 90-100 m
Wulong Formation [Hettangian-Sinemurian?]
total thickness approx. 380 m
Wulong Formation, Member C
Massive to bedded coarse to medium-grained
sandstones, calcareous with lenses of fossils, inter-
bedded with siltstones and shales; ammonite (J1w 1 ) near
top, bivalves and plant fragments also lower.
140.0.m
Wulong Formation, Member B
Interbedded limestones, siltstones and shales with
occasional thin greenish sandstones.
126.9 m
Wulong Formation, Member A
Thickly-bedded shelly limestones with brachio-
pods at top underlain by mixed limestone and sandstone
beds.
112.5 m
Zhamure Formation [?Rhaetian – Hettangian]
thickness over 170 m
Upper part interbedded sandstones, siltstones and
limestones, strongly folded and structural relations not
clear, separated by major fault zone from lower part of
red-coloured sandstones, siltstones and shales.
>170 m
Derirong Formation [Rhaetian] thickness over
120 m
Quartzitic sandstones, white to red-weathering,
thickly- to thinly bedded with cross-bedding and verti-
cal burrows; some calcareous beds with bivalves near
base.
>120 m
Norian and Carnian strata crop out towards main
track and to south.
The ammonites found will be presented and
discussed
Key words: Lower Jurassic; Stratigraphy; Wu-
long; Tibet
References:
Shi X.Y. Mesozoic and Cenozoic sequence stratigraphy
and sea-level changes in Northern Himalayas. In:
Research on the Sequence Stratigraphy of China.
Guangzhou: Guangdong Sci Tech Press, 2001:
283-352.
Shi X.Y., Jin J.R., Jia C.P. Mesozoic to Cenozoic se-
quence stratigraphy and sea-level changes in the
Northern Himalayas, southern Tibet, China.
Newsletters in Stratigraphy, 1996, 33: 15-61.
Shi X.Y., Sha J.G., Deng S.H. The Jurassic system of
China: Main characteristics and recent advances in
research. Progress in Natural Science, 2006, 16:
90-107.
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