Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

U. K. Bassi ¹, Suresh Chopra ¹, B. M. Datta ¹

Affiliations
1 98-100, 17-C, Chandigarh 160017, IN

Abstract

A Phanerozoic sequence except Carboniferous, has been identified in the eastern part of the Kinnaur district.· The strata have yielded a rich invertebrate fauna and ichnofossil assemblage besides plant fossils of Lower Permian age. Four sedimentary cycles punctuated by the Cambrian, Caledonian, Hercynian and Upper Callovian disruptions are identifiable, The rocks of this area have suffered from at least two phases of folding, as reflected in both major and minor structures.

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O. N. Bhargava ¹, U. K. Bassi ¹, Suresh Chopra ¹

Affiliations
1 529, Sector 18B, Chandigarh 160018, IN

Abstract

Ichnofossils Teichichnus, Phycodes aff. palmatum, Planolites, Ichnogenus indet. A and B, and Phycodes circinatum, P. aff. palmatum, Skolithos, Rouaultia and Planolites are being reported respectively from the basal and middle parts of the Yamrang La Formation of Ordovician age. Arthrophycus, Chondrites, Planolites, Rusophycus, Skolithos and Ichnogenus indet, C occur in the basal part of the Manchap Formation of silurian age. Phycodes circinatum Magdefrau 1934 mainly know from Lower Ordovician probably represents an Upper Ordovician age in this area.

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O. N. Bhargava ¹, U. K. Bassi ¹

Affiliations
1 529, Sector 18-B, Chandigarh, IN

Abstract

? Solenopora sp, indeterminate codiacid, dasyclad Vermiporella sp., and Cyanophite Girvanella sp., are reported from the Silurian Manchap Formation exposed in the Tidong Valley. The Manchap Formation in this area represents a reefoid environment.

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O. N. Bhargava ¹, U. K. Bassi ¹

Affiliations
1 Geological Survey of India, 98-100, Sector 17 C, Chandigarh 160 017, IN

Abstract

Bifasciculus and Phycodes pedum from the Cambrian Kunzam La Formation; Arthrophycus from the Silurian Takche Formation; arthropod markings and Paleophycus tubularis from the Devonian Muth Formation; Rusophycus and Skolithos from the Po Formation: Laevicyclus and Skolithos from Permian Kuling Formation; Gordia, Paleophycus A. Rhizocorallium, Skolithos and cephalopod wheeling traces from the Triassic-Liassic Lilang Group and Paieophyclis tubularis from the Jurassic Spiti Formation are recorded.

A checklist of trace fossils of the Western Higher Himalaya shows a paleoenvironmental control on trace fossil frequency. Comments on earlier described Taphrhelminthopsis circularis and Isopodiehnus are also furnished.

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U. K. Bassi ¹

Affiliations
1 S.C.O. 89-100, Sector 17-C, Chandigarh 160011, IN

Abstract

The geological database of the Phanerozoic Kinnaur Tethyan Basin in Himachal Pradesh is updated and its lower Palaeozoic lithostratigraphy revised to bring uniformity with the Spiti Basin. The paper also records the occurrence of middle Palaeozoic-Mesozoic rocks for the first time from the Baspa Valley. Some observations on the validity of certain fossil reports from this basin have also been made.

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U. K. Bassi ¹

Affiliations
1 Sco. 98-100 Sec. 17C, Chandigarh-160 017, IN

Abstract

No Abstract.

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O. N. Bhargava ¹, U. K. Bassi ¹

Affiliations
1 S.C.O. 98-100, Sector 17-C, Chandigarh-160017, IN

Abstract

Three distinct crystalline thrust sheets exist in the Himachal Himalaya. These in ascending tectonic order of superposition are: (i) Kulu Thrust Sheet, (ii) Jutogh Thrust Sheet and (iii) Vaikrita Thrust Sheet. The crystalline thrust sheets show five deformations and polyphase metamorphism. The analysis of existing data suggests that there have been Precambrian deformations and attendant metamorphism. The Kulu and Vaikrita Thrust Sheets extend throughout the length of the Himalaya and the latter's equivalents consistently form the floor for the Tethyan sequences.

Keywords

Igneous and Metamorphic Petrology, Precambrian, Tectonics, Himalaya, Himachal Pradesh.

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U. K. Bassi ¹, S. Chopra ¹

Affiliations
1 SCO No. 98-100, Sector-17C, Chandigarh 160 017, IN

Abstract

No Abstract.

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U. Bose ¹, S. C. Nagal ², N. L. Sharma ², K. C. Prashra ², V. K. Sharma ², U. K. Bassi ²

Affiliations
1 4/193, SFS, Mansarovar, Jaipur - 302 020, IN
2 S.C.O. 98-100, Sector 17-C, Chandigarh-160 017, IN

Abstract

Pyroclastics are found in all the late Proterozoic clastic formations of the Outer Krol Belt in the Simla Himalaya. The field and petrographic characters leading to identification of the pyroclastics are described here.

Keywords

Petrology, Pyroclastics, Late Proterozoic, Simla Himalaya.

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