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W. Fm, is composed largely of thick layered flows and sills. Samples for this study came from three differentiated komatiite lava flows, namely SA501, KBA12, and SA564, approximately 65 m-, 25 m-, and 23 m-thick, respectively. The latter has a well-preserved upper chilled margin and is separated by a fault from the SA501 and KBA12 series flows. The SA501 and KBA12 flows are stacked, with the latter directly overlying SA501. The chilled contacts for these latter two flows were not found. The details of petrography and mineralogy of the studied komatiites are given in, 2003.

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