Early Cambrian Ichnofossils and Lnarticulate Brachiopods from the Tal Group, Sirmaur District, Himachal Lesser Himalaya, India

The assemblage of ichnofossils and inarticulate brachiopods are recorded and described systematically from the Early Cambrian rocks of Tal Group exposed in Nigalidhar and Korgai synclines, Himachal Lesser Himalaya, India. The ichnofossil assemblage occurring in the rocks of Arenaceous Member of Deo ka Tibba (Lower Tal) Formation and Quartzite Member of Dhaulagiri (Upper Tal) Formation, Tal Group exposed in Rayon-Koti Dhaman section of Nigalidhar Syncljne contains Bergaueria sp., Cruziana sp., Didymaulichnus sp., Monomorphichnus sp., Neonereites biserialis, Palaeophycus sp., Plagiogmus sp., Planolites sp., Rusophycus sp., Skolithos sp. and Treptichnus sp. A few ichnofossils i-e. Palaeophycus sp., Planolites sp. and Skolithos sp. have also been recorded from the Arenaceous Member of Deo ka Tibba Formation exposed in Birpa - Bhitar ka Khala section in the Korgai Syncline. This ichnofossil assemblage is known worldwide in the Early Cambrian (Upper Meishucunian to Lower Qiongzhusian) rocks and is corllatable with Ichnozone - III (Crimes, 1987). The inarticulate brachiopods viz. Lingulellu sp., Magnicanalis sp., Mickwitzia sp., Obolella sp. and Obolus sp. of Tsanglangpuian Stage (Early Cambrian) occur alongwith ichnofossils namely, Palaeophycus sp. and Planolites sp, in the shale unit of Quartzite Member of Dhaulagiri Formation, Tal Group exposed in Birpa - Bhitar ka Khala section of Korgai Syncline.