basal age

ba·sal age

highest mental age level of the Stanford-Binet intelligence scale at which all items are passed.
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.
Additionally, artistic activity inferred from ochre is associated with TL dates of 75,000 to 116,000 years, and a rock-shelter section basal age of 176,000 [+ or -] 16,000 years was reported.
Consequently, a revised basal age for the rock-shelter section is found from the published age-depth curve (Fullagar et al.