Variolitic rock with well-developed prismatic jointing. Prisms almost flat, which grade downwards into normal Ben Hiant dolerite with vertical jointing about 40 ft . Vertical between S. 24235 and S. 24240. Memoir, pp. 170-171
Locality details
Scarp in gully 0.25 mile + 127 yds W 22 deg S of summit of Ben Hiant