Asteriacites and other trace fossils from the Po Formation (Visean–Serpukhovian), Ganmachidam Hill, Spiti Valley (Himalaya) and its paleoenvironmental significance

An assemblage of trace fossils comprising Asteriacites stelliformis, A. quinquefolius, Biformites insolitus, Helminthoidichnites? isp., Lingulichnus isp., Lockeia siliquaria, Palaeophycus tubularis, Planolites isp., Protovirgularia isp. A, Protovirgularia isp. B, Protovirgularia isp. C, Psammichnite...

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Bibliographic Details
Published in:Geologica Carpathica 2017-10, Vol.68 (5), p.464-478
Main Authors: Singh, Birendra P., Bhargava, Om N., Mikuláš, Radek, Prasad, Subhay K., Singla, Garry, Kaur, Ramanpreet
Format: Article
Language:English
Subjects:
Bioturbation
Casts
Cruziana ichnofacies
Density stratification
Fossil assemblages
Fossils
Po Formation
Sedimentary structures
Spiti
Storms
Stratification
Trace fossils
Visean-Serpukhovian
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Description
Summary:An assemblage of trace fossils comprising Asteriacites stelliformis, A. quinquefolius, Biformites insolitus, Helminthoidichnites? isp., Lingulichnus isp., Lockeia siliquaria, Palaeophycus tubularis, Planolites isp., Protovirgularia isp. A, Protovirgularia isp. B, Protovirgularia isp. C, Psammichnites isp., Rusophycus isp., and Treptichnus isp. from the Po Formation (Visean-Serpukhovian) exposed along the base of Ganmachidam Hill near the village of Chichong, Spiti Valley in the Himalaya, is described. Storm beds (tempestites) are highly bioturbated. Sedimentary structures such as hummocky cross-stratification (HCS), low-angle planar and trough cross beds, and shallow, slightly asymmetrical gutter casts are observed. The overall trace fossil assemblage indicates the presence of upper shoreface to lower shoreface Cruziana ichnofacies of an open shelf.
ISSN:1336-8052
1335-0552
1336-8052
DOI:10.1515/geoca-2017-0030