Be interesting if you had a way to "cut it in half" to see if it is a Geode or if there is something else equally interesting inside. Unique shape and materials though, like quick dried sedimentary layering, interspersed with harder material, "thrust up" in the middle, and unlike the granite and real hard shapes on the bank. That's a pretty interesting one, twisted rectangle, in the claw on the tractor! How do you farm with those boulders in your fields? They HAVE TO be hard on your equipment...sand here, no rocks, and sandspurs (the bane of a wildlife food plotter's existence).