St Michael’s Mount ancient forest

Evidence of an ancient forest has been uncovered on the beach near St Michael’s Mount after recent storms scoured away sand.
These tree stumps on the beach were revealed by the action of the waves.  St Michaels Mount in Cornwall was once known as ‘Karrek Loos yn Koos’ which translates as ‘Grey Rock in the Wood’, with John of Worcester, writing in 1099, that St Michael’s Mount was located five or six miles from the sea, enclosed in a thick wood.

Commissioned by St Ives Holidays

St Michael’s Mount (Cornish: Karrek Loos yn Koos, meaning “grey rock in the woods”, also known colloquially by locals as simply the Mount) is a tidal island 366 m (400 yd) off the Mount’s Bay coast of Cornwall, England, United Kingdom. It is a civil parish and is united with the town of Marazion by a man-made causeway of granite setts, passable between mid-tide and low water.

The island has a mix of slate and granite (see Geology below). Its Cornish language name – literally, “the grey rock in the wood” — may represent a folk memory of a time before Mount’s Bay was flooded. Certainly, the Cornish name would be an accurate description of the Mount set in woodland. Remains of trees have been seen at low tides following storms on the beach at Perranuthnoe, but radiocarbon dating established the submerging of the hazel wood at about 1700 BC. The chronicler John of Worcester relates under the year 1099 that St. Michael’s Mount was located five or six miles (10 km) from the sea, enclosed in a thick wood, but that on the third day of November the sea overflowed the land, destroying many towns and drowning many people as well as innumerable oxen and sheep; the Anglo-Saxon Chronicle records under the date 11 November 1099, “The sea-flood sprung up to such a height, and did so much harm, as no man remembered that it ever did before”. The Cornish legend of Lyonesse, an ancient kingdom said to have extended from Penwith toward the Isles of Scilly, also talks of land being inundated by the sea.

In prehistoric times, St Michael’s Mount may have been a port for the tin trade, and Gavin de Beer made a case for it to be identified with the “tin port” Ictis/Ictin mentioned by Posidonius.[2]

Historically, St Michael’s Mount was a Cornish counterpart of Mont Saint-Michel in Normandy, France (which shares the same tidal island characteristics and the same conical shape), when it was given to the Benedictines, religious order of Mont Saint-Michel, by Edward the Confessor in the 11th century.

St Michael’s Mount is one of 43 (unbridged) tidal islands which can be walked to from mainland Britain.

St Michael's Mount ancient forest

St Michael’s Mount ancient forest


  • Craig Weatherhill 7 years ago

    Please consult historians first, John of Worcester never mentioned the Mount at all. His entry for 1099 doesn’t specify a location but it’s thought likely to refer to southern North Sea coasts. The “true” date of the forest’s final submersion (calibrated RC) is c.2500 BC. Its trees were predominantly oak, beech, hazel and alder.

    Thanks for your constructive comment Craig. Will consult you next time for sure. Ansum

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