If you own land in Arkansas, Minnesota, or Wisconsin, rest secure in the knowledge that the land is expressly "declared to be allodial" by the state constitution. Ark. Const. art. 2, § 28; Wisc. Const. art. 1, § 14; Minn. Const. art. 1, § 15 ("are allodial" rather than "are declared to be allodial"). It may be igneous, or sedimentary, or metamorphic. It may be alluvial or illuvial (though likely not effluvial). But in any case, it's allodial.