Keroyal dolmen

The ideal “dolmen with corridor” ( French dolmen à couloir ) here in the tumulus

The Dolmen of Keroyal (also called Kerroyal or Roh-Vilhen) is completely inaccessible due to the thickness of the mud layer, in the flats of the Bono Canal, southwest of Keroyal , north of Plougoumelen in the Morbihan department in Brittany in France . In France, dolmen is the generic term for megalithic structures of all kinds (see: French nomenclature ).

Canal of Bono

Zacharie Le Rouzic (1864–1939) was able to examine the dolmen in 1908; he already mentions the difficulties in accessing it. It is covered by the tide twice a day. Its base is about 2.0 m above the average level of the sea. It is a "dolmen a couloir" with a corridor made of 18 bearing stones and a chamber with a single ceiling plate, which is called Roh-Vilen ( German: "yellow rock" ) because of the algae growth . The entrance to the 3.0 to 2.6 m wide chamber is in the southeast. A side chamber measuring 1.55 × 1.18 lies on the north side. The dolmen is about 8.0 m long, of which 4.2 m is accounted for by the 0.9 m wide corridor.

Sea level rise

Sea level rise over the past 24,000 years. Since the construction of the complex around 4000 BC BC it rose by about five meters

Allées couvertes, such as Kernic, are evidence of the rise in sea levels since the Neolithic , when the plants were not built so close to the sea . Examples are the Allée couverte in the Estuaire de la Quillimadec , the Cairn de Îlot-de-Roc'h-Avel and the menhirs of Penloïc near Loctudy (Finistère) and of Léhan . Another submerged dolmen ( French dolmen submergé ) is the Dolmen de la Table in front of the Île de Noirmoutier in the Vendée department . The dolmen of Karech-Loir on the Plage de Légenèse has completely disappeared.

literature

Jacques Briard : Mégalithes de Bretagne. Ouest-France, Rennes 1987, ISBN 2-7373-0119-X .
Reena Perschke: A propos des mégalithes disparus et oubliés: Le dolmen de Karech-Loir .