Abstract
Mathematical models have recently been used to cast doubt on the biotic origin of stromatolites. Here by contrast we propose a biotic model for stromatolite morphogenesis which considers the relationship between upward growth of a phototropic or phototactic biofilm ( v) and mineral accretion normal to the surface ( λ). These processes are sufficient to account for the growth and form of many ancient stromatolities. Domical stromatolites form when v is less than or comparable to λ. Coniform structures with thickened apical zones, typical of Conophyton, form when v⪢ λ. More angular coniform structures, similar to the stromatolites claimed as the oldest macroscopic evidence of life, form when v\\ Gg; λ.
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