Strontium isotope profiles are provided from the Austrian Salzkammergut and south-west England, two of the best available marine sections across the Triassic-Jurassic boundary. The results in the English section have been affected by diagenesis, but the Austrian results are excellent and demonstrate that, in favorable circumstances, trust-worthy Sr isotope results can be obtained from pure or nearly pure limestones, and oxygen isotope data provide the best means of obtaining an independent check. Although the Triassic-Jurassic boundary was marked by significant sea-level changes, this is not reflected in the Sr isotope results, which show no change across the boundary, in contrast to what has been claimed for the Cretaceous-Tertiary and Permian-Triassic boundaries.

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