Question: Beneath a 500-million-year-old lava flow is a 3-m-thick regolith of decayed rock fragments, red iron oxides, and cation-deficient clay minerals. Why is the geology student

Beneath a 500-million-year-old lava flow is a 3-m-thick regolith of decayed rock fragments, red iron oxides, and cation-deficient clay minerals. Why is the geology student who discovered this excited about his discovery?

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