Facies

, Volume 39, Issue 1, pp 243–272 | Cite as

Environmental distribution of trace fossils in the Jurassic of Kachchh (Western India)

  • Franz Theodor Fürsich
Article

Summary

Trace fossils occur abundantly in Middle Jurassic rocks of the Kachchh Basin. They are found in environments ranging from beach sequences down to central parts of the basin. For stratinomic reasons, they are particularly well preserved in storm deposits. Their distribution pattern exhibits a clear relationship to the hydrodynamic conditions and, secondarily, to bathymetry, and follows the classic ichnofacies concept ofSeilacher (1967). High energy nearshore areas and submarine shoals are represented by members of the Skolithos ichnofacies such asOphiomorpha nodosa, Arenicolites, Diplocraterion parallelum, andRhizocorallium jenense. The storm-influenced ramp contains both members of the Cruziana ichnofacies (e.g.Rhizocorallium irregulare, Thalassinoides suevicus, Taenidium serpentinum, Chondrites) and the Skolithos ichnofacies (in particularOphiomorpha). The former were produced during interstorm phases, the latter are of post-storm origin. Carbonate ramp environments of low to intermediate energy also contain members of the Cruziana ichnofacies, whilst equivalent siliciclastic environments are characterized by a low-diversity Zoophycos ichnofacies. Low energy basinal environments of fine-grained substrates contain an impoverished Cruziana ichnofacies consisting ofChondrites, Trichichnus andThalassinoides suevicus.

32 ichnotaxa are briefly described, among themSphaerichnus lobatus ichnogen. et ichnosp. nov.

Keywords

Trace fossils Taxonomy Ichnofacies Environments India Jurassic 

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Copyright information

© Institut für Paläontologie, Universität Erlangen 1998

Authors and Affiliations

  • Franz Theodor Fürsich
    • 1
  1. 1.Institut für Paläontologie der Universität WürzburgWürzburgGermany

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