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A Julian/Tuvalian (=Lower/Upper Carnian) substage boundary within the Kasımlar Formation, recently detected at Aşağiyaylabel (Taurus Mountains, Turkey) by facies analyses and biostratigraphic ammonoid investigations, was additionally detected by magnetic susceptibility (MS) and radiometry data. The Aşağiyaylabel sequence, a key section concerning environmental changes during Early to Late Carnian time, represents a deepening sequence from platform carbonates to pelagic limestones and marls. The Julian/Tuvalian boundary strata can be correlated over wide areas due to a positive shift in MS values from 11–105×10−6 SI (range AS I, KA IV) at the Lower Carnian sediments to 62–458×10−6 SI (range AS...

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