pyroxenite. The upper third is massive, monotonous bronzitite (Bronzitite zone). The Ultramafic series averages around 3500 feet (1100 m) in thickness.
*The Banded series is composed of alternating norite, gabbro and anorthosite. The Banded series has a maximum thickness of 14,000 feet (4300 m).

IUGS geological heritage site

In respect of it being 'one of the world's oldest layered intrusions, containing the world's highest-grade platinum-group element

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