Observations on the ichnospecies Monomorphichnus multilineatus from the Nagaur Sandstone (Cambrian Series 2-Stage 4), Marwar Supergroup, India

  • Mukund SharmaEmail author
  • S K PandeyEmail author
  • S Ahmad
  • K Kumar
  • A H Ansari


The Ediacaran–Cambrian Marwar Supergroup exposed in the western Rajasthan, India yielded abundant sigmoidal scratches assigned to ichnospecies Monomorphichnus multilineatus from the Nagaur Sandstone belonging to the Cambrian (Series 2-Stage 4). Nagaur M. multilineatus are recorded from the intertidal regime. It is an addition to already known depositional environments for this ichnospecies, which are known from shallow marine, wave-dominated, to non-marine or brackish water and storm-dominated sequences. Classical systematics of M. multilineatus is enriched with additional information in the paper. Its significance has been discussed regarding the palaeoecology of trace producers. Comprehensive statistical analyses help reveal its behaviour and feeding pattern of the causative organism of M. multilineatus. Hierarchical Cluster Analysis (HCA), average linkage and Pearson Correlation were performed to establish the natural grouping and behaviour of the specimens. HCA indicates that the studied Nagaur specimens belong to ichnogenera Monomorphicnus and ichnospecies, i.e., multilineatus. Pearson correlation, involving thickness and length of individual specimen, was positive. It indicates that the amount of food required by individual adult specimen was more and thereby requiring more grazing to provide enough food for survival. All the known occurrences of M. multilineatus are reviewed in the present study for their mode of preservation, depositional environment, palaeoecology and taphonomy.


Monomorphichnus multilineatus Kodymirus Nagaur Sandstone Marwar Supergroup India 



We are thankful to the anonymous reviewer and Prof. Nigel Hughes for very constructive suggestions offered on the earlier version of the manuscript. Mukund is indebted to Late Prof. B S Paliwal, JNV University for introducing the area and greatly benefited by the geological experience of Prof. Paliwal, and Late Dr R L Jain of the Geological Survey of India. Discussions with Profs. Nigel Hughes, Sören Jensen, S Kumar, M K Pandit, D K Pandey and S K Mathur helped us improve our arguments. We are grateful to the people of Dulmera village for allowing us access their lease areas and collect samples and data for this study for many years. The authors are thankful to Prof. Sunil Bajpai, Director, Birbal Sahni Institute of Palaeosciences, for extending the facilities to carry out the investigations and permission to publish this work (RDCC/2017-18/4).

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© Indian Academy of Sciences 2018

Authors and Affiliations

  1. 1.Birbal Sahni Institute of PalaeosciencesLucknowIndia
  2. 2.Bond Business SchoolBond UniversityGold CoastAustralia
  3. 3.Department of GeologyBanaras Hindu UniversityVaranasiIndia

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