  Thin elastic two-dimensionnal systems under compressive stresses may relieve
part of their stretching energy by developing out of plane undulations. We
investigate experimentally and theoretically the indentation of an elastic disk
supported by a circular ring and show that compressive stresses are relieved
via two different routes : either developing \textit{buckles} which are spread
over the system or developing a \textit{d-cone} where deformation is
concentrated in a subregion of the system. We characterize the indentation
threshold for wrinkles or d-cone existence as a function of aspect ratio.
