Stage : Fc, Francevillian, Paleoproterozoic, Proterozoic. Locality : Franceville Basin, Gabon, Central Africa. The natural vertical section of these stromatolites shows columns and pseudo-columns capped by flat laminae. This good sample appears in the publication that first described the Paleoproterozoic stromatolites from the Franceville Basin ( Microfossiliferous cherty stromatolites in the 2000 Ma Franceville Group, Gabon ).