Extended Data Fig. 1: TEM pictures of a specimen of Navifusa majensis, from the Grassy Bay Formation (Shaler Supergroup, Canada).
From: Oldest thylakoids in fossil cells directly evidence oxygenic photosynthesis
Pictures a, c and d show the width and limits of each layer interpreted as stacked thylakoidal membranes that were measured. Measurements are compiled in Extended Data Table 1 below. Picture b is a zoom of the section through the microfossil rounded end in a (black box). The parietal arrangement is clearly visible (dotted black lines), as well as the variable thicknesses of stacked thylakoidal membranes, due to merging of several thylakoids during burial, compression and diagenesis, dotted yellow lines show possible limits of several layers in the ticker one. These TEM pictures are from the same specimen illustrated in Fig. 2c,d; 3a,b.
