Figure F15. Close-up photograph of symmetrical basalt contact zones at 63-70 and 76-94 cm around a fragment of metachert at 71-75 cm (interval 198-1213B-32R-4, 56-99 cm). The upper gradation between basalt at 63-65 cm and diabase at 55- 63 cm is preserved in the uppermost piece. Elsewhere the basalt is fragmented (65-70 and 76-85 cm). Carbonate and clay-filled amygdules are present at 87-88 cm and glomerporphyritic clusters are present at 56, 59, 86, and 89 cm.

Figure F15. Close-up photograph of symmetrical basalt contact zones at 63-70 and 76-94 cm around a fragment of metachert at 71-75 cm (interval 198-1213B-32R-4, 56-99 cm). The upper gradation between basalt at 63-65 cm and diabase at 55- 63 cm is preserved in the uppermost piece. Elsewhere the basalt is fragmented (65-70 and 76-85 cm). Carbonate and clay-filled amygdules are present at 87-88 cm and glomerporphyritic clusters are present at 56, 59, 86, and 89 cm.