Figure F8. A. Photomicrograph in plane-polarized light of Sample 187-1157A-2R-1, 30-33 cm (see "Site 1157 Thin Sections"), showing an unaltered glass shard with quench crystals occurring as a clast in calcareous breccia matrix. B. Photomicrograph in plane-polarized light detailing the quench crystals in the glass shard pictured in A.