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Origin and history

Roc'h-Toul is a prehistoric cave located in the municipality of Guiclan, Finistère (Bretagne). Its name, of Breton origin, means "rock cave", with reference to its natural formation dug in the Armo Rican sandstones dated Ordovician. The cavity, 52 metres long, was mapped in 1970 by the Callot brothers, revealing a structure divided into two bedrooms separated by rocks.

The first archaeological excavations, conducted in 1868-1869 by Dr. Le Hir de Morlaix, revealed between 300 and 400 flint or sandstone blades attributed to the Magdalenian. The artifacts discovered included knives, scrapers, drills, arrow tips, and traces of charcoal, showing intense human occupation. The site, located 84 metres from the Penzé River, was probably linked to nearby troglodytic habitat, as evidenced by the remains found in the Parc-ar-Plenen field.

The cave was also studied by Commander Charles Bénard dit Le Pontois, then by Georges Laplace in the 1950s, who reanalyzed the lithic industries discovered. Ranked historic monument by decree of 22 October 1913, Roc'h-Toul illustrates the importance of Breton caves in understanding prehistoric lifestyles. Exhumed objects, including nuclei and sharp tools, confirm its use as a workshop of size and place of life during the Upper Paleolithic.

Dr Le Hir's research, published in 1874 in the Bulletin of the Archaeological Society of Finistère, remains a reference for the study of this site. The cave, although of modest dimensions, offers valuable insight into flint size techniques and the spatial organization of Magdalenian habitats in Brittany. Its ranking among historical monuments underscores its heritage and scientific value.

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