Basalt Cobbles & Onion Skin Weathering

Basalt Cobbles & Onion Skin Weathering

At Settlement Point east of Melbourne, extensive basalts and tuffs of the Older Volcanics form the cliffs and shore platforms. The spherical weathering occurs as water penetrates along joints and fractures, decaying the rock layer by layer like onion skin. At this site, the weathering has progressed until basalt cobbles are encased in fully decomposed clay.

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