Dear Sachin Kumar Tripathi, I suggest it is Elphidium which is epifaunal living on silty and sandy sediments in the inner shelf 0-50 m depth with warm conditions. It gives indication to brackish-hypersaline environments (Murray, 1991). Transition to normal marine conditions and a rise in the sea-level could be also deduced. Please, see attached paper. Ragards, Amr