NPS - Illustration
The Late Woodland Period (1400-750 B.P.) along the Upper Mississippi River and extending east to Lake Michigan is associated with the culture known today as the Effigy Moundbuilders. The construction of effigy mounds was a regional cultural phenomenon. Mounds of earth in the shapes of birds, bear, deer, bison, lynx, turtle, panther or water spirit are the most common images. Like earlier groups, the Effigy Moundbuilders continued to build conical mounds for burial purposes, but their burial sites lacked the trade goods of the preceding Middle Woodland Culture. The Effigy Moundbuilders also built linear or long rectangular mounds that were used for ceremonial purposes that remain a mystery. Some archeologists believe they were built to mark celestial events or seasonal observances. Others speculate they were constructed as territorial markers or as boundaries between groups.
The animal-shaped mounds remain the symbol of the Effigy Mounds Culture. Along the Mississippi River in northeast Iowa and across the river in southwest Wisconsin, two major animal mound shapes seem to prevail: the bear and the bird. Near Lakes Michigan and Winnebago, water spirit earthworks—historically called turtle and panther mounds—are more common.
The Range of the Effigy Mound Culture
The Effigy Mound Culture extends from Dubuque, Iowa, north into southeast Minnesota, across southern Wisconsin from the Mississippi to Lake Michigan, and along the Wisconsin-Illinois boundary. The counties of Dubuque, Clayton, and Allamakee contain almost all the effigy mounds found in Iowa.
NPS - Illustration
What do the Effigy Mounds Represent?
Clues can be found in American Indian legends and mythology and to a lesser extent, scientific research. The stories and legends of the Native Americans whose ancestors built the mounds describe the effigy mounds as ceremonial and sacred sites. Archeologists believe the effigy mounds delineated territories of choice gathering and hunting grounds. Unfortunately, much of the data is inconclusive.
Present day American Indian tribes affiliated with Effigy Mounds National Monument include:
Iowa Tribe of Kansas and Nebraska
Iowa Tribe of Oklahoma
Otoe-Missouria Tribe of Oklahoma
Ho-Chunk Nation of Wisconsin
Winnebago Tribe of Nebraska
Upper Sioux Community of Minnesota
Shakopee Mdewakanton Sioux Community In the State of Minnesota
Lower Sioux Indian Community of Mdewakanton Sioux Indians of Minnesota
Prairie island Indian Community In the State of Minnesota
Sac and Fox Tribe of the Mississippi in Iowa
Sac and Fox Nation of Missouri in Kansas and Nebraska
Sac and Fox Nation of Oklahoma
Crow Creek Sioux of South Dakota
Omaha Tribe of Nebraska
Santee Sioux of Nebraska
Standing Rock Sioux of North Dakota
Yankton Sioux of South Dakota
Did You Know?
The Sny Magill Unit of Effigy Mounds National Monument preserves at least 106 mounds representing the largest group of mounds in one location found in North America. The Unit contains two bird mounds, three bear mounds, 6 linear mounds and 95 conical mounds including a 2500 year old red ochre mound.