Typical examples of Abu Hureyra (AH) meltglass. (a) Photomicrograph of rough 2.5-mm-wide AH glass spheroid from level 457, sample E313, 413 cm depth. The term “level 457” refers to a single stratum as numbered by the original site excavators31. “Sample E313” was extracted from level 457 at 413 cm below a surveyed datum point. Numbers, depths, and ages of stratigraphic levels investigated are listed in Appendix, Tables S1 and S2. Sediment samples discussed in this article are from Trench E unless otherwise noted. (b) SEM image of the same glass fragment as in (a). (c) Photomicrograph of a 2.7-mm-wide fragment from level 449, sample E305, 412 cm depth. Yellow arrows point to inclusions of chromite and monazite. (d) SEM image of the same AH glass fragment as in (c). (e) Photomicrograph of 7.8-mm glass fragment from level 457, sample E313 at a depth of 413 cm depth. (f) SEM image of a different view of the same glass fragment as in (e).