Describing sedimentary rock that contains significant amounts of both clay and calcium carbonate (limestone), creating a mixed composition.
From Latin 'argilla' (clay) + 'calcareous' (from Latin 'calcarius,' relating to lime/calcium). A compound term describing dual mineral composition in sedimentary rocks.
When ocean creatures died and accumulated on the seafloor alongside muddy clay deposits, argillocalcareous rocks formed—they're basically the fossilized record of ancient seabeds!
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