Abstract
Lower Cambrian buildups in the subsurface of the Nepsko-Botuobinsky anteclise in southern Central Siberia were investigated with respect to the geometry of the reefs and their biotic and lithological composition. The buildups of the Osinsky horizon are characterized by an abundance of non-skeletal and skeletal algae (Epiphyton, Renalcis, Markovella et. al.) which acted as binders, encrusters and probably also as framebuilders. Archaeocyathids are important elements in the climax communities of some successions. The buildup rocks are limestones and dolomites (algal boundstones, archaeocyathid/algal boundstones, algal wackestones and mudstones). Coarsegrained reef detritus is missing.
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