Landlab has the ability to add layers to the grid. Two types of layers are currently supported. First is EventLayers in which each event is preserved as an entry into the datastructure, even if no deposition occurs. If you are interested in chronostratigraphy, this is probably what you are interested in. Second is MaterialLayers, in which each layer must contain some material. If an entire layer is eroded in MaterialLayers, the layer is removed. MaterialLayers will likely use less memory than EventLayers.