Unstained cellulose lacquer peel, examined under PPL brightfield illumination. The picture shows both thin layer images and replica images. The large uncovered coccolithophore in the lower left-hand field has a diameter ca. There are indications of similar features buried in the dark kerogen in the right-hand field. The thick kerogen layer appears very dark.
Uncovered objects show bright white optical figures.
The diameter of the largest buried coccolithophore in the right-hand field of Fig. Numerous coccoliths including some embedded in a layer of kerogen. Unstained cellulose lacquer peel, examined under PPL brightfield illumination. The picture shows both thin removed layer images and replica images. The numerous coccoliths have diameters in the range from ca.