FIGURE 1.Summary table of the geochronological positioning of the Teresina Formation (subdivision proposed by Walker and Geissman, 2009).
FIGURE 3. 3.1 - General view of the location where silicified stromatolite blocks occur; 3.2 - Blocks of silicified stromatolites; 3.3 - Outcrops in the Acesso Ivens Vieira-Angatuba road cutting, with large silicified bioherms at the base (Figure 3.4) and silicified levels (S).
FIGURE 5. Bioherm with structure in the form of "scales" at the top (5.1) and macrostructure of anastomosed, non-isolated multiple columns showing parallel to divergent growth and a laminar profile ranging from slightly convex to parabolic in the longitudinal section (5.2-3); 5.4 - Three-dimensional model of the bioherm (Drawing by Raphael Galassi de Amorim).
FIGURE 7. 7.1 and 7.2 - Individual columns with convex to parabolic lamination; 7.3 and 7.4 - Weathered bioherm exhibiting multiple columns and fine stromatolitic lamination with alternating light and dark laminas on a petrographic slide (7.4).
FIGURE 8. 8.1 - Microcolumns forming a botryoidal texture at the top of a bioherm; 8.2 - Longitudinal section showing lamination and a divergent arrangement of microcolumns; 8.3 - Fine stromatolitic lamination on a petrographic slide; 8.4 - Longitudinal petrographic slide showing the lamination and arrangement of microcolumns; 8.5 and 8.6 - Filamentous cyanobacteria arranged perpendicular to the lamination; 8.7 - Microcoleus; 8.8 - Rivularia; 8.9 - Detail of Rivularia showing a preserved mucilaginous sheath and cell wall.
FIGURE 9. SEM images. 9.1 - Fossil of filamentous bacterium (secondary electrons); 9.2 - Fossil of 9.1 mapped by silica content via EDS (red) showing the high contents of the matrix and cell wall (backscattered electrons); 9.3 - Detail of a silicified cell wall and partially hollow interior (secondary electrons).
FIGURE 10. 10.1 - Angatubia cowperesioides; 10.2 - Articulated shell of Pinzonella illusa isolated at the top of a bioherm; 10.3 - Detail of coquina and top of the bioherm on a petrographic slide; 10.4 - Detail of coquina on a slide (10.3) with crossed nicols; 10.5 - Detail of stromatolitic overgrowth in bioclasts on a slide of coquina (10.3); F - Upper view of the fossiliferous concentration.