Ichnology and Depositional Environment of the Cambrian Nagaur Sandstone (Nagaur Group) Along the Dulmera Section, Bikaner-Nagaur Basin, Rajasthan  

作　　者：Birendra P.SINGH O.N.BHARGAVA Ravi S.CHAUBEY Naval KISHORE 

机构地区：[1]Department of Geology (CAS), Panjab University, Chandigarh 160014, India [2]103, Sector-7 Panchkula (Haryana) 134109, India

出　　处：《Acta Geologica Sinica(English Edition)》2014年第6期1665-1680,共16页地质学报（英文版）

基　　金：University Grant Commission (UGC, New Delhi), is acknowledged for providing the research grant to BPS (No.F.20-1/2012 (BSR)/20-8(12)/2012/BSR)

摘　　要：The Lower Cambrian Nagaur Sandstone（Marwar Supergroup） has yielded trace fossils Treptichnus, Cruziana, serially repeated Rusophycus, Diplichnites, Monomorphichnus, Bergaueria,arthropod swimming traces and leap frogging marks of Cruziana ichnofacies. This ichnofossils assemblage is dominantly preserved in fine to medium grained red sandstone beds of the Mohra Member（Nagaur Sandstone）. The presence of graded rip-up clasts, current ripples, dune crossstratification with mud drapes and tidal bundles indicates a subtidal paleoenvironment for the deposition of Nagaur Sandstone Formation, which is corroborated by the Cruziana ichnofacies trace fossil assemblage.The Lower Cambrian Nagaur Sandstone（Marwar Supergroup） has yielded trace fossils Treptichnus, Cruziana, serially repeated Rusophycus, Diplichnites, Monomorphichnus, Bergaueria,arthropod swimming traces and leap frogging marks of Cruziana ichnofacies. This ichnofossils assemblage is dominantly preserved in fine to medium grained red sandstone beds of the Mohra Member（Nagaur Sandstone）. The presence of graded rip-up clasts, current ripples, dune crossstratification with mud drapes and tidal bundles indicates a subtidal paleoenvironment for the deposition of Nagaur Sandstone Formation, which is corroborated by the Cruziana ichnofacies trace fossil assemblage.

关 键 词：Nagaur Sandstone Mohra Member trace fossils Cruziana ichnofacies subtidal paleoenvironment 

分 类 号：P534.41[天文地球—古生物学与地层学]