Fig. 3 in Mat-forming coccoid cyanobacteria from early Silurian marine deposits of Sudetes, Poland

Fig. 3. Optical micrographs of early Silurian radiolarian cherts from Żdanów in horizontal thin sections. A. Three globular aggregates of coccoid cyanobacteria forming mats visible in amorphous organic background. B–D. Magnified aggregates of variously degraded coccoid cyanobacteria showing different size of cells and mucilage sheaths. Some cells are filled with granular material resembling reproductive cells (baeocytes) of modern coccoid cyanobacteria. E, F. Magnified fragment of cyanobacterial colony (aggregate), partly degraded, showing individual cells. F. Optical micrographs with Nomarski illumination. All ZPAL Cy.1 GBŻ 49/1−4.