Abstract
Abstract Clypeasteroid echinoids can be common in both siliciclastic and carbonate sedimentary sequences of the Miocene of the Mediterranean and Paratethys areas where they frequently form highly fossiliferous deposits. Two echinoid assemblages dominated by clypeasteroids from the early-middle Miocene of Logudoro region (Northern Sardinia) are compared using a detailed sedimentological and taphonomic analysis along with functional morphological considerations. The assemblages differ widely with respect to taxonomic composition, sedimentological features, and taphonomic signatures, such as the orientation and degree of abrasion, encrustation, and bioerosion. The first assemblage (Ardara) is characterized by a low-diversity echinoid fauna, consisting exclusively of the two clypeasteroid genera, Amphiope and different morphotypes of Clypeaster. This deposit represents a proximal tempestite originating in a high-energy, shallow-water, shoreface setting. Higher diversity characterizes the second assemblage (It...
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