Das et al.1 have studied clay mineralogy, terrigenous and biogenic components of the sediment core collected from the Ocean Drilling Programme site 728A, northwestern continental margin of the Arabian Sea, off Oman. Their main objectives were to understand palaeoclimatic conditions, such as monsoons fluctuations, weathering processes and transport pathways of sediments from the neighbouring continental areas to the northwestern Arabian Sea and during the late Quaternary period.