Small glassy spheres, ellipsoids, teardrops, cylinders and dumbbells occur in large numbers in Tertiary deep sea clays cored in the northeastern Pacific by the Deep Sea Drilling Project. These objects morphologically resemble microtektites, but have the composition of an oceanic tholeiite. On the basis of their composition and stratigraphic relationship it is considered that they are of volcanic origin and most likely have been formed in deep water by submarine volcanic processes.

Supplement to: von der Borch, Christopher C (1971): Glassy objects in Tertiary deep-sea clays cored by the Deep Sea Drilling Project. Marine Geology, 10(1), 5-14