In Search of the St. Louis Mound Group: Archaeoastronomic and Landscape Archaeology Implications

The Cahokia Mound Group in Illinois, USA, is acknowledged as the largest Native American city north of Mexico. It flourished during the Mississippian Period. Cahokia, however, was only one of three complexes in the immediate area. Located across the Mississippi River from Cahokia, the St. Louis Mound Group was part of the larger complex.The St. Louis Mound Group featured at least 25 earthen mounds including the so-called Big Mound that contained dozens of human burials.In the 1800s the St. Louis Mound Group was leveled to allow for urban expansion. Few records are in existence documenting the location or other details concerning the group. As a result, an important part of prehistory seems lost.  In this paper the likely location for the St. Louis Mound Group is identified using survey plats from the 1850s, early lithographs and other data. Findings are assessed for astronomical alignments and landscape relationships, with possible cosmological implications noted.