Microcodium is commonly developed in central-southern Sardinia; usually, it occurs within brecciated fine grained limestones (solution breccias) laid over a Paleozoic-Mesozoic carbonate substratum, often karstified, and covered by marine deposits, prevailingly Early Eocene (Ilerdian) in age. At places, microcodium also develops in carbonate-dolomitic layers interbedded in arenaceous argillites with Charophyta, partly Paleocene (Thanetian) in age. The corn-cob morphological type is the most widespread, sometimes with very long elements. Microcodium represents a good continentality marker in central-southern Sardinia; a warm semi-arid climate and wide flat areas, sometimes covered by palustrine deposits, presumably were the environmental condition for its development.

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