Late Triassic and Early Jurassic Ammonoids from Eastern Himalayas

Geoscience ›› 2007, Vol. 21 ›› Issue (1): 31-44.

• Engineering Geology and Environmental Geology • Previous Articles Next Articles

Late Triassic and Early Jurassic Ammonoids from Eastern Himalayas

YIN Jia-run¹, LIU Gui-fang²,XIE Yao-wu³

1School of Earth Sciences and Resources,China University of Geosciences, Beijing100083,China;
2Institute of Geology,Chinese Academy of Geological Sciences, Beijing100037,China;
3The Geological Survey Team of Tibetan Geological Exploring Bureau, Lhasa,Tibet851400,China

Received:2006-11-21 Revised:2006-12-27 Online:2007-01-20 Published:2007-01-20

Abstract

Abstract:

Late Triassic and Lower Jurassic ammonoids were newly collected from Kongma, Lhozag and Lonzi, eastern Himalayas, including Tibetites sp, Anatibetites sp., Glyphidites sp., Cyrtopleurites sp., Parajuvavites sp.,Sagenites sp.,Phormedites sp.(Middle Norian),Arnioceras ceratoides, Angulaticeras sp.，Arnioceras sp., Juraphyllites sp., Epideroceras sp.(Sinemurian), and Phricodoceras cf.cornutum, Uptonia sp., Galaticeras sp., Gleviceras cf. paniceum (Pliensbachian). Glyphidites, Phormedites, Epideroceras, Phricodoceras and Uptonia are known in China for the first time. The ammonoid assemblages stratigraphically exhibit an episodic appearance, or a discontinuous sequence, dating the Columbianus, Semicostatum and Jamestoni Zones; the faunal migration or dispersal are referred to as global bio-events, forced by sea-level changes.

Key words: eastern Himalayas, Tibet, Late Triassic, Early Jurassic, Ammonoids

CLC Number:

Q915.81

YIN Jia-run, LIU Gui-fang,XIE Yao-wu. Late Triassic and Early Jurassic Ammonoids from Eastern Himalayas[J]. Geoscience, 2007, 21(1): 31-44.

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Late Triassic and Early Jurassic Ammonoids from Eastern Himalayas

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