This has been my most challenging cake so far! It is a 4-6-8 chocolate peanut butter cake with chocolate mousse filling. All fondant except for the dino figures, which are fondant and tylose. The back side of the cake shows a geologic stratigraphy column complete with dino bones. Grass and vines are buttercream. The waterfall is piping gel over fondant with buttercream 'foam'. This cake was so much fun!!!