Orthophragminids with new axial thickening structures from the Bartonian of the Indian subcontinent - Özcan, E. (Istanbul Technical University. Department of Geological Engineering) ; Kumar Saraswati, P. (Indian Institute of Technology Bombay. Department of Earth Sciences) ; Hanif, M. (University of Peshawar. National Centre of Excellence in Geology) ; Ali, N. (University of Peshawar. Department of Geology)