The black chat pettles are less more rounded. [Some of these are certainly black bed in shale inclusions] The green quartz pettles are more common above and make up 70% of Sharon pink conglomerate. Dar mr Arthrophyacus on a trace of a fossil. I see no reason why the whole of this basal formation is just Dalina, = red Dalina shales and Sharonympunk conglomerate. [Dr 1965 Barrett got Arthrophyacus here] This serpentine comes from the Grenville series in the Blue Mountains.