This paper presents an application (Le Stratifiant) which makes it possible to create automatically stratigraphic diagrams. Le Stratifiant uses a simple algorithm, based on an adjacency matrix. It provides a graphic representation slightly different from the Harris Matrix, in order to avoid ambiguities, and to represent more easily different types of relationship. It can also processes indicators of dating (terminus post quem, terminus ante quem), in order to assign a bracket of dating to each stratigraphic unit, and to visualise these brackets. Another important characteristic, which is also a methodological choice, is the possibility of processing two levels of relations: normal, or uncertain. Le Stratifiant is developed on a preexisting software (Microsoft Excel). This choice allows to benefit from all the possibilities of this common software, like import – exports files and communication with data bases.