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              <p>Ice aprons are very small (generally &amp;lt; 0.1 km2) and thin (generally &amp;lt; 10 m) perennial ice bodies located on steep slopes with a quasi-stationary shear regime, frozen to steep permafrost rock slopes. They occupy – mainly above the glacier equilibrium line altitude – a very small fraction of the ice-covered surface but, with their quasi-stationary shear regime, contain ice that is multi-centennial to multi-millennial in age, making them a potentially important glacial heritage. In order to study these ice masses in their full thickness, a lightweight 10 m long ice corer was specially developed and successfully deployed on the northern face of Grandes Jorasses (4208 m a.s.l.) in July 2023. This article describes the technical characteristics of the ice corer and how it was used on a large ice apron of one of the largest rock faces in the Alps. It also presents the strategies we intend to use to analyse the extracted 8.8 and 6.0 m long ice cores.</p>
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