Weaver draws conclusions that need to be supported by more experimentation before they can be taken seriously by archaeologists. Thin-section analysis of ceramics from the St. Louis area has yielded certain facts that are briefly presented in order to show that grog-tempering is common in the Mississippi valley. Crushed-sherd tempering is a cultural reality and does not represent inclusions in potter's clay as Weaver suggests.
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James W. Porter (1964) studied this question.
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