Cambrian Calcareous Cyanobacteria and Algae

摘要: The Cambrian calcareous flora is dominated by cyanobacteria which include the Angulocellularia, Botomaella, Girvanella and Obruchevella groups. important generic groups based on Renalcis Epiphyton are also probably cyanobacterial. Proaulopora possibly a cyanobacterium. No calcified red algae known during period. earliest dasycladaleans may be represented very rare fossils Yakutina (Middle Cambrian) Seletonella (Upper Cambrian). sudden appearance of heavily near base reflect change in environmental conditions enhanced CaCO3, precipitation rates sea. Groups such as creating reef limestones they often so abundant that impart dendritic fabric to rock (dendrolite).