The Rb-Sr dating technique is among the most widely used geochronological tool available in earth and planetary sciences. The method is based on the radioactive decay of 87Rb to 87Sr via a negative beta decay (the emission of an electron), with a half-life of 49.61 ± 0.16 Ga1. Traditionally rubidium-strontium dating has required the separation and acid digestion of mineral phases and/or bulk rocks, thus preventing high-resolution and micro-scale geochronology applications. Here we present results of the novel in-situ (laser-based) rubidium-strontium dating of selected mineral phases (i.e., glauconite and K-feldspar) in glauconite-rich strata of the Arumbera Sandstone from the northeast part of the Amadeus Basin in central Australia.