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Cambrian Trilobites from the Parahio and Zanskar Valleys, Indian Himalaya

Published online by Cambridge University Press:  11 August 2017

Shanchi Peng ,
Nigel C. Hughes ,
Noel A. Heim ,
Bryan K. Sell ,
Xuejian Zhu ,
Paul M. Myrow  and
Suraj K. Parcha
Shanchi Peng
Affiliation:
State Key Laboratory on Paleobiology and Stratigraphy, Nanjing Institute of Geology and Paleontology, Nanjing 210008, China,
Nigel C. Hughes
Affiliation:
Department of Earth Sciences, University of California, Riverside, 92521, USA,
Noel A. Heim
Affiliation:
Department of Earth Sciences, University of California, Riverside, 92521, USA,
Bryan K. Sell
Affiliation:
Department of Earth Sciences, University of California, Riverside, 92521, USA,
Xuejian Zhu
Affiliation:
State Key Laboratory on Paleobiology and Stratigraphy, Nanjing Institute of Geology and Paleontology, Nanjing 210008, China,
Paul M. Myrow
Affiliation:
Department of Geology, Colorado College, Colorado Springs, 80903, USA
Suraj K. Parcha
Affiliation:
Wadia Institute of Himalayan Geology, Dehra Dun, Uttranchal 248001, India
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Abstract

New collections of trilobites from the type section of the Parahio Formation in the Parahio Valley, Spiti, and from the Parahio, Karsha, and Kurgiakh formations in the Zanskar Valley, permit biozonation based on material precisely located within measured stratigraphic sections. Specimens preserved in limestone with mild tectonic deformation clarify the features of several Himalayan taxa known previously only from severely deformed specimens preserved in shale. A total of 75 trilobite taxa from the Cambrian of Spiti and Zanskar can be referred, questionably at least, at the generic level or below, and 61 of these are present in our new collections. This new material is assigned with confidence to 29 existing species, and to 12 new species. Three new genera, Haydenaspis, Bhargavia, and Himalisania, are established; new species include Haydenaspis parvatya, Prozacanthoides lahiri, Probowmania bhatti, Xingrenaspis parthiva, X. shyamalae, Bhargavia prakritika, Kaotaia prachina, Gunnia smithi, Sudanamonocarina sinindica, Proasaphiscus simoni, Koldinia odelli, and Torifera jelli. Ten additional Himalayan forms are assigned at the generic level only, and another 11 are questionably assigned to genera or species. The zonation proposed includes 6 zones and 3 levels, including the Haydenaspis parvatya level, the Oryctocephalus indicus level, the Kaotaia prachina Zone, the Paramecephalus defossus Zone, the Oryctocephalus salteri Zone, the Iranoleesia butes level, the Sudanomocarina sinindica Zone, the Lejopyge acantha Zone, and the Proagnostus bulbus Zone. The sections span from the upper part of the informal Stage 4, Series 2 of the Cambrian System, about 511 Ma old, to the Proagnostus bulbus zone of the Guzhangian Stage near the top of Series 3, dated at about 501 Ma. This time interval is represented by about 2000 m of section, which is thick compared to similar intervals elsewhere and is consistent with high rates of sedimentation along the Himalayan margin at the time. The fauna resembles others from equatorial peri-Gondwanaland, with closest similarity to that of South China. It also bears strong affinity to the North China fauna. Juvenile trilobites are described for the first time from India. A new Chinese species, Monanocephalus liquani, is also described.

Type
Research Article
Information
Journal of Paleontology , Volume 83 , Issue S71: Paleontological Society Memoir 71. CAMBRIAN trilobites from the Parahio and Zanskar valleys, INDIAN HIMALAYA , November 2009 , pp. 1 - 95
Copyright
Copyright © 2009 Paleontological Society 

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