Cahokian Neighborhood Dynamics: New Geophysical Data from Rouch Mound Group and Rattlesnake West Neighborhoods

In this article we present the results of two geophysical surveys conducted at Cahokia Mounds State Historic Site. The goal was to reveal neighborhood settlement patterns at two locales located on the periphery of “Downtown” Cahokia—the densely populated administrative core—and to further understand the type and chronological affiliation of these settlements. We compared structure length and width ratios from Rattlesnake West and the Rouch Mound Group with datasets from the Cahokia and East St. Louis precincts as a proxy for chronological affiliation to understand changes to neighborhood density over time. Using noninvasive techniques to illuminate population density and neighborhood configurations, we gained a more detailed understanding of how Cahokia's communities and neighborhoods chose to adopt the building style and infrastructure of Cahokia's Downtown Precinct.