basal age

ba·sal age

highest mental age level of the Stanford-Binet intelligence scale at which all items are passed.
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References in periodicals archive ?
Radiocarbon analyses of marl carbonates provide a basal age of 27,060 [+ or -] 1,080 years before present (Tx-973) for the deposit and a minimum age from the upper marl unit of 13,630 [+ or -] 200 years before present (Tx-976; Velastro et al., 1975).