Discovery of Precambrian–Cambrian boundary protoconodonts from the Gangolihat Dolomite of Inner Kumaun Lesser Himalaya: Implication on age and correlation

Discovery of Precambrian–Cambrian boundary protoconodonts from the Gangolihat Dolomite of Inner Kumaun Lesser Himalaya: Implication on age and correlation

The Gangolihat Dolomite (Deoban Formation) of the Calc Zone of Pithoragarh in the Inner Kumaun Lesser Himalaya, hitherto regarded of Mesoproterozoic age (∼1600–1000 Ma) on the basis of the so-called Riphean stromatolites, has yielded numerous earliest Cambrian protoconodont sclerites characterizing...

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Bibliographic Details
Published in:Current science (Bangalore) Vol. 86; no. 12; pp. 1653 - 1660
Main Authors: Azmi, R. J., Paul, S. K.
Format: Journal Article
Language:English
Published: Current Science Association 25-06-2004
Subjects:
Carbonates
Dolomite
Fossils
Geology
Limestones
Magnesite
Mining
RESEARCH COMMUNICATIONS
Slates
Stratigraphy
Stromatolites
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Summary:The Gangolihat Dolomite (Deoban Formation) of the Calc Zone of Pithoragarh in the Inner Kumaun Lesser Himalaya, hitherto regarded of Mesoproterozoic age (∼1600–1000 Ma) on the basis of the so-called Riphean stromatolites, has yielded numerous earliest Cambrian protoconodont sclerites characterizing the Precambrian–Cambrian boundary (∼544 Ma). This fossil discovery fosters a firm chronostratigraphic correlation between the Inner Carbonate Belt and the Krol Belt (Outer Carbonate Belt), now both of Vendian–Early Cambrian age. The present contribution thus resolves an important stratigraphic correlation problem of the Lesser Himalayan geology. And it has a major implication on the tectonic interpretation of the Lesser Himalaya, which is crucial for its palinspastic reconstruction.
ISSN:0011-3891