Assertion: shell tempered pottery | /r/HasProperty | excavated at the zebree site
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Source sentences:
text: The record indicates that around 800 CE, early populations of Mississippian peoples produced shell-tempered pottery in the Central Mississippi Valley at sites, such as the Fairmont Phase at Cahokia and the Early Mississippian strata excavated at the Zebree Site (3MS20) at Big Lake in northeastern Arkansas.