155- Arènes Latour Gaillardet Gaiagraphy 1 Giving Depth to the Surface – an Exercise in the Gaia-graphy of Critical Zones * Alexandra Arènes°, Bruno Latour§, Jérôme Gaillardet+ SOC°, Sciences Po§, Physique du Globe+ Keywords: critical zone, cartography, Anthropocene, projection, geochemistry (accepted for publication in Anthropocene Review) Abstract: Foregrounding the importance of soil and more generally the surface of the earth —what is now often called the Critical Zone (CZ)— remains very difficult as long as the usual planetary view, familiar since the scientific revolution, is maintained. In this joint effort coauthored by a landscape architect, a historian of science and a geochemist, we propose what is called in history of drawing an anamorphosis, that is, a distorsion of image made through an instrument or a change in perspective. Such anamorphosis allows to shift from a planetary vision of sites located in the geographic grid, to a representation of events located in what we call a Gaia-graphic view. We claim that such a view is much better suited to situate the new actors of the Anthropocene because it brings pride of place to the CZ.