Cromlech de la Croix Bonnin
MonumentHidden Treasure
The enigmatic megalithic remains of the Neolithic period, the Croix Bonnin cromlech, with its raised stones, stands at the gateway to Beaulieu-lès-Loches, a rare testimony to a solar or funerary cult over 4,000 years old.
© Wikimedia Commons
History
In the heart of Touraine, a few leagues from the Indre and its ancient forests, the Croix Bonnin cromlech is one of the rare examples of a megalithic circle preserved in the Centre-Val de Loire region. Where isolated dolmens and menhirs dominate the Neolithic funerary landscape of the department, this cromlech - a Breton word meaning an alignment of stones arranged in a circle or ellipse - offers a monumental configuration of precious singularity in this territory of the southern Parisian Basin. What makes this site truly remarkable is its geographical rarity: cromlechs, well documented in Brittany and the British Isles, are exceptionally rare in the Indre valley. The circle of standing stones at La Croix Bonnin therefore represents a major archaeological milestone for understanding the ritual practices of the agro-pastoral populations who populated Touraine between 3500 and 2000 BC. Its position on the edge of the region - the place name "Croix Bonnin" itself evokes a medieval superimposition on an ancient memorial site - suggests the sacred continuity of the site across the millennia. The experience of visiting the site is one of silent communion with the depths of time. The stones, set in the hedged farmland characteristic of southern Touraine, seem to converse with the sky from angles studied by their builders. At dawn or solstice, the light reveals alignments that the distracted eye cannot see in broad daylight. The monument invites contemplation as much as scientific enquiry. The surrounding area reinforces the timeless nature of the visit: the gentle wooded hills of the Indre valley, the open fields that have preserved the silhouette of the stones over the centuries, and the proximity of Beaulieu-lès-Loches - with its Romanesque abbey and medieval streets - make this excursion a journey through the superimposed layers of French history. The Croix Bonnin cromlech, listed as one of the Republic's first historic monuments in 1889, bears witness to France's early recognition of the heritage value of its prehistoric heritage.
Architecture
The Croix Bonnin cromlech belongs to the large family of megalithic monuments with a circular or elliptical layout, characteristic of the Neolithic period in Western Europe. Made up of a series of blocks of local stone - probably Touraine limestone or sandstone, materials abundant in the subsoil of the Indre-et-Loire region - these orthostats were erected vertically in a precise geometric layout, with an estimated diameter of between ten and twenty metres, in line with the standards observed for cromlechs in western France. The construction technique was based on extracting, transporting and erecting blocks weighing several hundred kilograms, without the use of metal or wheels. The blocks were probably transported using wooden sledges, levers and a collective organisation involving several dozen people. They were set in the ground using foundation trenches reinforced with stone wedges, a process that archaeological excavations have revealed at comparable sites such as the Er Lannic cromlech (Morbihan) and the Saint-Just cromlech (Ille-et-Vilaine). The layout of the stones, even if partially collapsed or incomplete to date, suggests a marked architectural intention. The general orientation of the circle, potentially aligned with sunrise at the summer solstice, gave the monument a calendrical or astronomical function that doubled its possible funerary purpose. Some of the stones may have disappeared over the centuries, having been reused in local rural buildings, a common practice for megaliths in the region.
Related Figures
Communautés néolithiques de la vallée de l'Indre (bâtisseurs originels, vers 3500-2000 av. J.-C.)Antiquaires tourangeaux du XVIIIe siècle (premiers à inventorier le monument dans des mémoires érudits)Arcisse de Caumont (archéologue normand, pionnier de l'étude des mégalithes français, dont les travaux contribuèrent à la reconnaissance de tels sites)Prosper Mérimée (inspecteur général des Monuments historiques, dont l'action prépara le terrain législatif conduisant au classement de 1889)
