A naturally formed sandstone concretion from Fontainebleau, France, composed of exceptionally fine quartz sand cemented by silica. Mounted on a metal base; 40 × 39 × 16 cm; 30.15 kg. Whitecap is a distinctive example of the sandstone concretions known as Gogottes, found within the exceptionally pure sands of the Fontainebleau region in northern France. These sands were deposited during the Oligocene Period, approximately 30 million years ago, although the process through which they became cemented into sculptural formations occurred considerably later, during successive Quaternary glacial periods. The formation is composed of broad, rounded layers that fold over and around one another, creating a compact structure punctuated by openings, recesses and projecting lobes. Its pale, finely textured surface emphasises the uninterrupted movement of these contours. The title Whitecap draws attention to the uppermost folds, whose swelling forms and suspended edges suggest the crest and foam of a breaking wave. Gogottes developed as silica-rich groundwater passed through the Fontainebleau sands. Dissolved silica precipitated between the exceptionally fine quartz grains, binding them together through a gradual and irregular process. Variations in the movement of water and the intermittent deposition of silica produced their characteristic ridges, cavities and fluid outlines. The resulting formations are composed almost entirely of quartz, despite possessing an appearance that can resemble modelled clay or carved stone. Admired as natural curiosities since at least the seventeenth century, Fontainebleau sandstone formations were incorporated into several of the gardens at Versailles under Louis XIV. Their undulating forms have subsequently invited comparison with the biomorphic sculpture of Jean Arp, Henry Moore and Barbara Hepworth. Entirely uncarved, Whitecap occupies a compelling position between geological specimen and sculptural object, demonstrating how natural processes can produce forms closely aligned with the language of modern abstraction. A detailed condition report is available upon request.