Supplementary Material

Figure S1. SEM images of cut and polished coated bubble: (A) cross-section of a cut bubble. The B-F areas are located as white rectangles; (B) needle-like CaCO₃ crystals in external layers of the coated bubble’s wall; (C) rosette-shaped CaCO₃ crystals in the external layers of the coated bubble’s wall; (D) spherical radial needle crystals of CaCO₃ forming the inner layers of the coated bubble; (E, F) hemispherical radial needle crystals of CaCO₃ in the internal part of the bubble; (G) schematic cross-section of the cut bubble with the location of image A.

Figure S2. FTIR spectra of coated bubble (source: Rruff database): (A) aragonite with characteristic peaks of intensity at 699, 712, 855, 1082 and 1446 cm⁻¹; (B) calcite with characteristic peaks at 712, 871, 1165, 1399 and 1796 cm⁻¹. Additional peaks correspond to the LR-white resin.

Table S1. Description of the facies and their depositional environments.

© E. Vennin et al., Published by EDP Sciences 2021