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The Yuha cairn burial from southeastern California is said to be more than 21,000 years old, based on radiocarbon dates and a Th-230 date obtained on soil carbonate. The burial itself is undated. Several other cairn burials are known from the California deserts, and these are dated from 5000 B.P. to historic times. Until the Yuha burial itself is dated, one must consider that it may belong to this more recent pattern of disposal of the dead.
In recent years research has been directed to looking for the origins of agriculture and to finding the causes of the transition from hunting and gathering to food production and the domestication of plants and animals. From these studies it has become apparent first, that the transition occurred several times and in several places in prehistory; secondly, that the mechanisms underlying the transition are quite complex; and thirdly that the transition occurred in some regions but not in others, in spite of the prevalence of similar environmental conditions and patterns of exploitation.
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