Paleobiogeography,paleoecology and paleoenvironmental significance of the Cambrian trilobites from the Zanskar region (Zanskar-Spiti-Kinnaur Basin), Northwest Himalaya |
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| Authors: | Birendra P Singh |
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| Institution: | 1.Center for Advanced Study in Geology,Panjab University,Chandigarh,India |
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| Abstract: | In present study the newly recorded latest Middle Cambrian trilobite fauna from the Cambrian succession of the Zanskar region
of Zanskar-Spiti-Kinnaur Basin (Tethyan Himalaya) is analyzed critically to assess relationships with other Cambrian faunal
elements of equatorial peri-Gondwanaland. The identification of genus Neoanomocarella, Parablackwelderia, Kunmingaspis, Fuchouia, Damesella and Dorypyge from the Cambrian of the Zanskar region and their comparison with those of South China and Australia is significant. It constitutes
the basis for assessing the paleobiogeographic affinities during the Cambrian. The latest Middle Cambrian trilobite fauna
from Zanskar shows proximity of Indian margin with that of southwest China “outboard” micro-continent. The recovery of analogous
Middle Cambrian species i.e., Dorypyge perconvexlis, Fuchouia bulba, Fuchouia cf. oratolimba, Parablackwelderia sp. and Damesella sp. from the Zanskar region (Tethyan Himalaya) suggests a contiguous close proximity with south China and Australia during
the latest Middle Cambrian, which supports the model of Meert and Van der Voo (1997) for assembly of Gondwanaland. The presence
of Kunmingaspis in Zanskar and similar reports from northwestern Yunnan-Tibetan region, northern Henan, central and southeastern Hubei, north
China, western Xinjiang and Yangtze platform reveal a close affinity between the Indian margin and the Yangtze platform during
the Middle Cambrian. The trilobite fauna indicates the deeper shelf-shallow slope environment of deposition under fluctuating
conditions of relative sea-level. The faunal elements of the Lejopyge acantha and Proagnostus bulbus zones indicate that the sea inundated the northern margin of Zanskar region during the latest Middle Cambrian time (Teta
transgression) which is synchronous with globally recognized eustatic events during Lejopyge laevigata Zone. |
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