A new stratigraphic occurrence of the taxon Pagetia (Trilobita) from the Spiti region and its biostratigraphic significance in correlation of the Wuliuan Stage (Miaolingian Series) in the Kashmir and the Spiti regions (Tethyan Himalaya), India

Abstract

Abundant, though moderately well-preserved, specimens of Pagetia sp. are recorded along with the ptychopariid Xingrenaspis dardapurensis from a new stratigraphic level which lies above the Oryctocephalus salteri biozone in the Spiti region (Himalaya). This occurrence of Pagetia in a higher stratigraphic level (higher than the Oryctocephalus salteri biozone) from the Spiti region helps in understanding the distribution of this taxon in the Cambrian of the Kashmir and Spiti regions of the Himalaya. A Pagetia-Xingrenaspis association from the Kashmir region is already known, the present discovery of a similar association in the Spiti region enables the Wuliuan (Miaolingian) biostratigraphic correlation between the Kashmir and the Spiti regions. The record of the taxon Pagetia from a higher stratigraphic level in the Spiti region contradicts the previous assumption that the Pagetia bearing level in Kashmir is equivalent to the Pagetia-Oryctocephalus indicus (O. indicus biozone, Hayden horizon 2) in the lowest part of the Wuliuan in the Spiti region.