M. Tiwari, PRECAMBRIAN-CAMBRIAN BOUNDARY MICROBIOTA FROM THE CHERT PHOSPHORITE MEMBER OF TAL FORMATION IN THE KORGAI SYNCLINE, LESSER HIMALAYA, INDIA, Current Science, 71(9), 1996, pp. 718-720
Abundant and well preserved organic walled microfossils are recorded f
rom the Chert-Phosphorite Member of the Tal Formation, in the Korgai S
yncline, Lesser Himalaya, Two principal categories of microfossils inc
luding spheromorphic acritarch and small acanthomorphic acritarchs are
present in the assemblage. Interesting among these two categories are
Leiospheridea sp., Micrhystridium regulare, M. sp. A, M. sp. B, M. sp
. C, M, sp. D and Veryhachium sp. The appearance of large Micrhystridi
um population together with small shelly fauna has been used as a crit
erion to demarcate the Precambrian-Cambrian boundary in China(1) where
these microfossils have been discovered from the black chert in the p
hosphatic rocks of the lowest Kuanchuanpu Member in Ningqiang of south
ern Shaanxi.