Figure 5
SEM images of surficial clay minerals collected from the outer part of fossils showing the presence of smectite (indicated by white arrows) and nontronite (encircled by the white dotted line). The identification of clay minerals was made based on the published catalog56. (a) Smectite (S) present on Alveolina test (b) Nontronite (N) and Smectite (S) present on Nummulites test (c) Smectite (S) on bivalve shell (d) Smectite (S) on gastropod shell. All the scale bars represent 200 nm.
