Measurements from a range of marine depositional environments in the We compare semi-quantitative smear slide composition estimates to physical property (natural gamma radiation, NGR)Īnd solid-phase geochemical (calcium carbonate, CaCO3 %) Smear slide petrography has been a standard technique during scientific ocean drilling expeditions to characterize sediment composition and classify sediment types, but presentation of these percentĮstimates to track downcore trends in sediment composition has become lessįrequent over the past 2 decades.
