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The prominent white band in this and later photos is the kaolinite clay that rained down from the sky within a few hours of the asteroid impact, preserved in a calm, shallow water environment. The (slightly) iridium enriched layer is a thin brown rusty zone at the top of the clay.
0525G_ObliqueCloseup.JPG (274 Kb) (under photos/16/0525-30_NewMexicoVan/0525_TrinidadKT_Maloya/)
By Alan Silverstein, ajs@frii.com (page updated Sun Mar 9 14:33:54 MDT 2025)