The Folkert Mound Group of Hardin County, Iowa is a collection of 27 prehistoric mounds on the bluffs above the Iowa River, in a variety of shapes, including linear, compound, conical, and an enigmatic cruciform mound.

The earliest map of the mounds was made by John Hotopp in 1974,[2] and the mound group was mapped in detail in 2006.

[3] The alignment of the cruciform mound is especially interesting to researchers.

[4] Horton[5] felt the cruciform mound aligned with the 11th century Crab Nebula supernova.

This article about a property in Hardin County, Iowa on the National Register of Historic Places is a stub.