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Asturias outcrops, northern Spain, as an analog. Upper to middle slope lithofacies are dominated by: 1) massive "cabbage-shaped" to "wave laminated" micrite-cement boundstone with dominant marine cements (25-60%) in primary cm-dm irregular-shaped voids with minor skeletal grains; 2) micrite-cement boundstone with minor "growth" structures, few primary voids, minor cement (<25%) and abundant platform-derived skeletal grains and; 3) mosaic breccia of in-place collapsed boundstone. Microfilamental fossils are abundant and interpreted as cyanobacterial species. It is most likely that microbes have played a role in the genesis of the peloidal and accretionary fabrics and mediated the growth of marine cements.