Strontium Chronology

Gypsum: Isotopes & Dating

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Gypsum is a relatively soft and common mineral made up of hydrous
calcium sulfate (CaSO4-2H2O). Whilst pure gypsum crystals are transparent
(often with a pearly or vitreous luster), they can appear opaque and colored
due to the inclusion of other materials (e.g. sand).

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Strontium dating of foraminifera, shells & corals

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Strontium dating (as enabled by the 87Sr/86Sr ratio of marine carbonates) can be used to date various marine samples based on the premise that the mixing of oceanic strontium occurs relatively rapidly through time compared to the residence time of oceanic strontium.

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