. "SDN:S04::S0424" . "" . "optical microscopy and stratigraphic dating"@en . "accepted"@en . "Optical microscopy is the identification and quantification of biological entities or other small objects using a conventional optical microscope. Stratigraphic dating is the determination of the age of a sample by comparative techniques e.g. location in a sequence or study of fossil assemblages."@en . . . . . . . . . .