Southeastern United States
Mississippian culture pottery is the ceramic tradition of the Mississippian culture 800 to 1600 CE found as artifacts in archaeological sites in the American Midwest and Southeast. It is characterized by the use of shell tempering agents in clay paste. Shells from mussels found in the rivers was finely ground and mixed with local clay to form the pots. When the pots dried they were wood fired in a pit.
I just learned that Fort Walton Beach Florida has a museum with over 6000 artifacts from the Mound Builder culture and the finest collection of Fort Walton period ceramics in the Southeastern United States. I hope to visit the museum soon. Thanks for reading and for all your comments.