Plant imprints on surfaces of AH glass. (a–c) Photomicrographs of AH glass (AG) with silicified plant imprints (P). (d–k) SEM images of carbon-infused, siliceous plant imprints (P) on AH glass (AG). (i–m) Multi-element EDS maps of same objects in images above. Magenta represents Al, Blue represents Ca, and Gold represents Si. Carbon is not shown, but SEM-EDS indicates it is almost exclusively associated with the Si-rich imprints. From level 457, sample E313, 413 cm depth. (l–n) SEM images of polished charred organics embedded within AH glass. The reflectance-derived temperature is ~421 °C, much lower than the laboratory-measured melting point. AH meltglass from level 445, sample E301, 405 cm. Inferred temperature range of ~1200° to 1300 °C for melting AH glass.