Describing sedimentary rock or sediment that contains a mixture of clay and sand particles in roughly equal amounts.
From Latin 'argilla' (clay) + 'arenaceous' (from Latin 'arena,' sand + '-aceous,' containing). A compound geological term combining two sediment types.
This is a geologist's way of saying 'this rock is stuck between being sandy and clayey'—it's like rock indecision, with about 50/50 of each mineral type!
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