1. A method for transforming a subsurface model, the method comprising: generating by a processor a current model representing current locations of particles of sediment in a subsurface structure; generating by a processor a set of equations that are linear and independent of each other; transforming by a processor the current model according to the set of equations to generate a depositional model representing past locations of the particles of sediment at a time when the particles were computed to be originally deposited in the Earth, wherein each equation in the set of linear and independent equations defines a different independent paleo-geographic coordinate in the depositional model; and displaying the depositional model.