Mixed siliciclastic-carbonate sediments result from the interaction of a siliciclastic input and a coeval carbonate production. Mixed deposits consist of a suite of different types of mixing between the two components, from bed to stratigraphic scales, producing a high vertical and lateral lithological variability. Although mixed deposits are very diffuse in the geological record, studies about these deposits are scrappy and not well encoded. Accordingly, mixed deposits can represent a labyrinth for researchers who want to investigate them for the first time. The aim of the talk is to highlight main aspects and their peculiarities.