08 June 1990
Vol 248, Issue 4960

About The Cover

Polished surface of a submarine basalt breccia formed by explosions >1800 meters below sea level south of Japan. The clast on the right may be accidental but the surrounding matrix quenched and welded during the submarine eruption. The matrix consists of basalt glass shards with vesicles 0.1 to 0.2 millimeter in diameter. See page 1214. [Shipboard photograph by C. Galida, Ocean Drilling Program. Sample is ODP Leg 126 791B-66R-2, piece 1c; field of view is 1.2 centimeters by 1.8 centimeters.]