Cattle Oiler Archeological Site National Register of Historic Places Listing

The Oahe Dam was coming. In the mid-20th century, the rising waters of the Missouri River threatened to swallow hundreds of ancient indigenous villages. Archaeologists scrambled. Among the dirt and salvage gear at the mouth of the Cheyenne River in Stanley County, researchers uncovered the Cattle Oiler site (39ST224). They found something messy, complicated, and incredibly old. It wasn't just one camp. Instead, two entirely different cultures had built their homes on the exact same terrace, centuries apart. The lower level revealed long, rectangular earthlodges from the Initial Middle Missouri tradition, dating back to around AD 1100. These people grew maize, hunted bison, and fortified their perimeter with a deep ditch.

But then things changed. Around AD 1500, a completely different group of people reclaimed the terrace. These later inhabitants belonged to the Extended Coalescent tradition, and they brought a totally different architectural style. They built circular lodges. We know this because when excavators sliced through the dirt, they found circular postholes cut directly into the ruins of the older rectangular homes. The physical evidence was stark. Digging through the trash heaps, researchers pulled out thousands of pottery fragments, side-notched flint arrowheads, and bone grease scrapers. It showed a shift in how people lived, worked, and survived the harsh Plains winters.

Water covers most of it now. Still, the data saved during those frantic 1960s digs remains vital for Plains anthropology. It proved that the architectural shift wasn't a whim. Actually, Cattle Oiler provides the physical proof. It shows intense cultural contact, overlap, and eventual replacement along the Missouri trench. It is a rare, stratified puzzle. Without it, our understanding of how the ancestors of the Mandan and Arikara navigated shifting territories would have huge, empty gaps.