EXTENDED ABSTRACTS: 19TH HIMALAYA-KARAKORAM-TIBET WORKSHOP, 2004, NISEKO, JAPAN Biostratigraphy and biogeography of the Tethyan Cambrian sequences of the Zanskar Ladakh Himalaya and of associated regions Suraj K Parcha Wadia Institute of Himalayan Geology, 33 - Gen. Mahadeo Singh Road, Dehra Dun -248 001, INDIA For correspondence, E-mail:
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[email protected] .................................................................................................................................................................................................................................................................... The Cambrian sections studied so far exhibit 4 km thick and North America Diplagnostus has been reported from the Lejopyge apparently conformable successions of Neoproterozoic and laevigata Zone which characterizes the latest Middle Cambrian. Cambrian strata in Zanskar - Spiti basins. The Cambrian In the Lingti valley of the Zanskar area the presence of Lejopyge sediments of this area are generally fossiliferous comprising sp. is also of stratigraphic importance as it underlies the trilobites, trace fossils, hylothids, cystoids, archaeocythid and characteristic early Late Cambrian faunal elements. In the Magam brachiopod, etc. In parts of Zanskar – Spiti and Kashmir region section of Kashmir the Diplagnostus occurs at the top of the rich trilobite fauna is collected from the Cambrian successions. Shahaspis (=Bolaspidella) Zone of Jell and Hughes (1997), that is The trilobites constitute the most significant group of fossils, overlain by the Damesella Zone, which contains characteristic which are useful not only for the delimination of various biozones faunal elements of Changhian early Late Cambrian age. The but also for the reconstruction of the Cambrian paleogeography genus Damesella is also reported from the Kushanian stage in of the region. China, the Tiantzun Formation in Korea and from Agnostus The Zanskar basin together with a part of the Spiti basin pisiformis Zone of the Outwood Formation in Britain.