Extended Data Fig. 2: TEM pictures of the second specimen of Navifusa majensis from the Grassy Bay Formation (Shaler Supergroup, Canada).
From: Oldest thylakoids in fossil cells directly evidence oxygenic photosynthesis
Pictures a and b show some positions where thickness of layers were measured and clearly illustrate the limits of each layer interpreted as stacked thylakoidal membranes. Measures are summarized in the Extended Data Table 1 below. Picture c shows knife marks (dotted lines) creating artefacts on ultrathin sections. These knife marks are clearly distinguishable from limits of stacked thylakoidal layers. Picture c also shows that on a same ultrathin section, the limits between layers may be less clear, due to merging during burial and compression. n = 2 N. majensis for Grassy Bay Formation. “n” represents the number of specimens observed by TEM.
