Cambrian sequences in the Tethyan zone of Spiti Himalaya and its boundary problems
Parcha, S. K.
published: Oct 14, 1996
ArtNo. ESP026003401008, Price: 29.00 €
The Cambrian sequences of Spiti basin are exposed in the Pin Valley, Parahio valley and in the Kunzum La Takche section. They pass conformably downwards into a thick sequence of Late Precambrian lithologies. On the basis of the faunal studies in these sections various faunal assemblages have been recorded from these sequences; characteristic faunal gaps occur in the lower part of Lower Cambrian, lower Middle Cambrian and in the Upper part of Middle and Upper Cambrian. These gaps are represented by barren zones. In the Pin-Parahio sections the uppermost part of the Cambrian is marked by an angular unconformity but in the Kunzum-La section this unconformity is not as apparent as in the Pin-Parahio Valley, but the change in lithology is very prominent. An attempt has been made to discuss the position of intra system boundaries and the affinities of the fauna with other Cambrian sequences. It has been observed that the Middle and Upper Cambrian fauna contains elements similar to Australia, Indochina and the other cosmopolitan genera.