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BQ 3A News > Blog > France > Excursion de France 2025: Peloton came upon Archaeological Cuirk Breton
France

Excursion de France 2025: Peloton came upon Archaeological Cuirk Breton

July 10, 2025
Excursion de France 2025: Peloton came upon Archaeological Cuirk Breton
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Beiond Recreation, Turkey De France additionally offers the chance (re) to find our landscapes, and every now and then their geological quiries. The path of the SevMe’s segment Excursion de France 2025 starts in Saint-Malo to sign up for Murs-de-Brittany. Simply after Iffinik, the cyclists will cross in the course of the pledge, within the town recognized for the penan camp, whose partitions … are vitrified. Explanations.

At the stone partitions, the rocks as a rule had been held through mortom: made to consolidate development, the latter is a shepherd combination consisting of dust, linden or hydraulic cement with water. The entire, which is hardened whilst dried, then acts as adhesive. The varieties of mortar and their use numerous over the years: there are lines in their use from Neolithic (10,000 years), however their composition is assorted and specialised in -4000 BC. EC in historic Egypt.

The buildings also are established with out using mortar: it’s the case a few of the Greeks, who used the one vertical powers or in Inca, who used polygonal stones, however completely adapt to the neighbors so as to stabilize the development.

Rarer, then again, is constructions through which stones are neatly glued to one another, however with out contribution to exterior subject material: they’re then immediately reworked and welded at the spot. This is known as the vitrified partitions, situated in Castle de Peran, in Brittany, within reach are ready for the passage of cyclists.

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The most efficient preserved castle in France

Camp Perana, within the the town of Pledran, is recognizable with a strengthened housing, situated on the first heights (160 meters), which dominate Ifficine, 9 km southwest of Saint-Brieuca, in Cote-d’Armor. Up to now recognized within the area underneath the identify of the blistered stones, this web page equipped archaeological portions (spoons, portions, and many others.) from 1820-1825. However the first publications associated with Jules Geslin de Burgundy in 1846. years.

It used to be halved that where used to be Galically Oppidum, earlier than it used to be became a Roman camp. Excavation campaigns have enabled and decide its instinct: it’s estimated that the camp is estimated as a historic monument, the date of Tradition of TENA (roughly 450 to twenty-five earlier than the brand new generation), the Apogee of Celic Tradition finishing with Roman conquest.

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After Gallic Generation, where used to be taken through Viking, of which the intrusion used to be recognized at about 9. and 10. century, in addition to on the thirteenth century, attesting the terracotta tile.

The elliptical form, it covers roughly one hectare (160 meters to 140) and has 5 concentric defensive constructions.

Enigma of vitrified partitions

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This castle, which is absolute best preserved in France, has a specificity of its 5 defensive constructions: stone stones used to be welded since the phase used to be melted at the outskirts of blocks, forming a pitcher that cemented the rocks between them. Such partitions, frequently related to fortifications, exist in all of the outdated continent, however particularly in Northern Europe. In France, we most effective know twenty, from Brittany to Alsace, with a vital focus in Limouse, Creuse and Loire, all granite international locations.

file 20250618 56 4m0u8c.jpeg?ixlib=rb 4.1

The vitrified wall. What acts as a mortar (black with white dots) is a pitcher, leading to partial fusion of Sainte-Suzanne, Maienne Rock. JP Morteveille, delivers the writer

file 20250618 56 h5ig5a.jpg?ixlib=rb 4.1

Darkish, the bully glass is inserted between the fragments of granite. Gilbert Scorching, which delivers writer

Those vitrifications of an vintage intrigue. From mid-18th century, any such wall used to be signed in within the basement of the home in Sainte-Suzanne, in Maienne. Then we marvel: what fireplace used to be violent sufficient to soften the stone and thus vitrifi? And used to be it a fiery or fruit of an twist of fate? The one recognized herbal vitrifications had been the ones associated with vulcanism and, to a lesser extent, led to through lightning (absolutely influencing the ambience, which failed to succeed in the bottom, as a recognized Libyan glass, equivalent to a well-known Libyan glass).

The primary to provide the vitrification for combustion is Augusta Daubree (1881), adopted through Alfred Lacroik (1898). Certainly, observations on grannies (wealthy in drive, due to this fact) disclose partial fusion, roughly complicated at slightly low temperature. If granite or gneiss melts about 950 ° C in floor prerequisites, the presence of water lets in fusion at a decrease temperature (of 840 ° C).

Hearth

file 20250618 56 ylvte3.jpg?ixlib=rb 4.1

Camp partitions Peran, 2013. Gilbert Crevo, delivered through writer

We all know nowadays how this vitrification used to be received: through combusting wood beams that armed the galic partitions. In truth, galic ramps that provided optimum, but additionally sure villas (farms of noblemen), had been constructions related to intertwined layers of horizontal beams stuffed with flooring with dry stones “(no mortar).

The hearth of water purification dropped the Granite Instructor who created a pitcher through cooling. Underneath terrestrial floor prerequisites, “dry granite” melts about 950 ° C and “hydrated granite” of 840 ° C. Due to this fact, the presence of water would permit this granite connection.

file 20250618 62 ri7otl.jpg?ixlib=rb 4.1

Paran Paran, west of Pleotran. A l. a. carte Ign is contested on that air picture. Equipped the writer

For its very majority, vitrified fortifications are present in granite areas. Indisputably, it’s no accident, since the temperature of the granite melee is slightly low in comparison to the ones bases, which happens greater than 1450 ° C. A planned or random personality through fireplace, but the purpose of debate stays.

TAGGED:archaeologicalBretonCuirkdiscoveredFrancePelotontour
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