Fig. 1.

Radial mean of electron diffraction intensity for graphene (thin lines) of modern origin (charred fungal Sclerotium), of supernova origin [cores of graphitic spherules isolated from the carbonaceous chondrite meteorite Murchison (30)], and from the onset of the Younger–Dryas (carbon spherules isolated from Santa Rosa Island, CA). Diffraction patterns were also acquired with longer exposure times to measure faint, high-angle peaks (thick lines). Graphene in microcharcoal from Murray Springs, AZ (∼12,900 cal yr B.P.) and in carbon spherules as well as glassy carbon from Santa Cruz Island, CA (15,498–16,209 cal yr B.P.) are nearly identical to above.