Journal of Earth Science & Climatic Change
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Well preserved Thalassinoides isp., Ophiomorpha isp., Planolites isp., and Psilonichnus isp., trace fossils are reported from
Pokaran Sandstone of the Jodhpur group, the lower succession of the Marwar Supergroup. Marwar Supergroup is 1000m
thick lithostratigraphic unit occupies a large area in north western Rajasthan that is unconformably overlies on 779-681 Ma old
Malani igneous suites. It is sub-divided in three group?s viz., lower Jodhpur Group; middle Bilara Group and upper Nagaur Group,
where as Jodhpur and Nagaur Group have argilla -aranaceous sequences and Bilara Group has calcareous sequence. Pokaran
Sandstone is unconformably overlies on Pokaran boulder bed which is basal lithofacies of Late Neoproterozoic - Early Cambrian
Marwar Suergroup. The Pokaran boulder bed occurs in three distinct forms viz., massive conglomerate, boulder spread and
stratified conglomerate. These three forms of the boulder bed independently rest over the basement of Malani rhyolite. Whereas
Pokaran Sandstone is subdivided in two lithofacies red to maroon shaly sandstone and light brown to reddish brown fine to
medium grained sandstone. These trace fossils are preserved in light brown to reddish brown fine to medium grained sandstone
in Pokaran area which is 180 km northwest of Jodhpur. They are identified as Thalassinoides suevicus isp., Ophiomorpha isp.,
(produced by decapod crustaceans) Planolites isp., (produced by worm like aminals) and Psilonichnus isp., (produced by
All these ichnogenera (Thalassinoides isp., Ophiomorpha isp. and Planolites isp.,) show shallow marine depositional
environment and Psilonichnus isp., shows marsh environment. No age can be assigned on the basis of these trace fossils as they
range from Cambrian to Recent.
Manu Rastogi, is a third year student of University of Petroleum & Energy Studies, Dehradun, India pursuing Bachelor of Technology in Geo
Sciences. He has worked as a GIS intern in company ?Map My India?, New Delhi for six weeks. He has a sound academic record. His areas of
interest are Geologic Surveying, Structural Geology and Sedimentology. He has been seeking a challenging career in the Oil & Gas sector, where
his technical knowledge and managerial skills can be utilized effectively for the mutual benefit of the organisation, as well as his professional career.
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