{"refrec":{"BRefID":120021,"RR":"<b>Gandin, A.; Debrenne, F.; Debrenne, M.</b> (2007). Anatomy of the Early Cambrian 'La Sentinella' reef complex, Serra Scoris, SW Sardinia, Italy, <b><i>in</i></b>: Álvaro, J.J. <i>et al.</i> (Ed.) <i>Palaeozoic reefs and bioaccumulations: climatic and evolutionary controls. Geological Society Special Publication,</i> 275: pp. 29-50","BEntID":114233,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":", <b><i>in</i></b>: Álvaro, J.J. <i>et al.</i> <i>Palaeozoic reefs and bioaccumulations: climatic and evolutionary controls. Geological Society Special Publication,</i> 275: pp. 29-50","DocTypID":17,"DocType":"Book chapters","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Gandin, A.; Debrenne, F.; Debrenne, M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Gandin, A.; Debrenne, F.; Debrenne, M.","Englishabstract":"All bioherms from the Early Cambrian (Botoman) Matoppa Formation of the Nebida Group in SW Sardinia were previously thought to be dominated by <i>Epiphyton</i>. However, at 'La Sentinella' (Serra Scoris Hill), they are composed of <i>Girvanella, Razumovskia, Botomaella</i> and <i>Renalcis</i>, with <i>Epiphyton</i> and archaeocyaths as accessory components. This association forms two unusual types of crust boundstone, consisting of stacked flat or curved crusts and saucer-like archaeocyaths delimiting shelter cavities. Dendrolitic Renalcis archaeocyath-cement boundstone caps the bioherm. Analysis of the La Sentinella reef complex and comparison with similar constructions from Mongolia (Zuune Arts, Salaany Gol), Nevada (Stewart's Mill, Battle Mountain), Mexico (Sonora) and China (Tianheban Formation) suggest that episodic deposition of fine-grained siliciclastic or carbonate sediment followed by periods of non-deposition enabled the calcimicrobial rafts and crusts to colonize the substrate and then provide synoptic relief for the development of a dendrolitic <i>Renalcis</i>-cement framework. 'La Sentinella' is one of the rare examples of Cambrian reef complex displaying community replacement, from an initial stage of thrombolitic and/or flat-stacked microbial crusts on a muddy substrate to an arched microbial crust system, to a more resistant <i>Renalcis</i>-cement boundstone. Such bioherms reflect an open-shelf, shallow-marine environment of increasing energy. 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