Lower Cambrian bioconstructions in Southwestern Sardinia (Italy)

Abstract

Bioconstructions in the Lower Cambrian of Sardinia are the result of the activity mainly of algae and Archaeocyatha. They vary in shape from complex lenses to flat bedded bodies. The core of the construction is constituted either of Archaeocyatha or Epiphyton tufts or Girvanella mats while the periphery is dominated by Archaeocyatha. Burrowing is well developed. No true vertical biozonation inside the buildup. Association and sedimentologic characters suggest a submarine setting system under shallow conditions, low salinity and energy.