He cannot reject the discovery as false without doing an injury to his sense of truth, and he cannot accept it as a fact without shattering his accepted beliefs. However, after examining the strata above and below the Castenedolo skeletons, and after finding no indication that they were intrusively buried, Keith surprisingly concluded that the enigma must be resolved by an intrusive burial. He justified this by citing the unfossilized condition of the bones. However, these bones were encased in a clay layer. Clay would prevent water from transporting large amounts of dissolved minerals into the bone cells and explain the lack of fossilization.
Fossilization depends much more on chemistry than age.
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