Tywyn’s Petrified Forest & The Welsh Atlantis


The storms that hit the Welsh coastline in January 2014 caused thousands of pounds of damage to coastal defences and buildings but did have a silver lining as they uncovered 4-miles of ancient woodland stretching between Tywyn and Aberdyfi that had previously been submerged beneath the sand and shingle.  Whilst it is not uncommon for storms to reveal parts of Tywyn’s Petrified Forest it has been many years since such a large area has been revealed.

If you take a stroll along the beach at low tide you will come across logs and tree stumps preserved by the acid anaerobic conditions provided by the peat in which they lie.  The peat-bed is believed to be at least 1m deep with its surface scarred by many neatly cut rectangular pits – the remains of peat cutting for fuel.  These cuttings are so well preserved that spade marks are still visible in some faces.  Whilst the historical evidence is sketchy, it is believed that Tywyn’s peat was exploited in the 18th century and this probably continued into the mid-19th century when the arrival of the railways brought cheap coal (Tywyn was joined to the Cambrian Coast railway in 1863).  Whilst peat cutting in moorland areas usually terraces the land with long advancing faces, Tywyn’s peat-bed has been cut into neat architectural features with each pit being separated by its neighbour by a peat ‘wall’ to avoid water-logging.  Some of the pits are even provided with drainage channels.

Higher Resolution Images of Tywyn’s Petrified Forest

More pictures of Tywyn’s Petrified Forest

Update: Take a look at some more pictures from our recent visit in January 2015.

This submerged forest provides evidence that the coastline used to be further west and that the sea level has risen.  The tree stumps have been Radio Carbon dated to around 3500 BC but how far this forest extended is anybody’s guess.  Estimates range from 1.5- to 5-miles but until scientists can reveal the extent of the area claimed by the sea we will have to rely on legend.

Cantre’r Gwaelod

The existence of this vast submerged forest is often held up as evidence for Cantre’r Gwaelod (the Bottom hundredth), a mythical lost land, ruled by Gwyddno Garanhir (Longshanks) born circa 520 AD.  Cantre’r is said to have extended from the current shoreline 20-miles west into what is now Cardigan Bay.  Legend has it that the land here was so fertile that an acre was worth four elsewhere, however, this fecundity depended upon a dyke to hold back the sea.  At low tide the sluice gates were opened to drain water from the land and then closed at night as the tide returned.  However, one terrible night (circa 600 AD), Cantre’r Gwaelod was lost to the sea as a result of one man’s jealousy and carelessness. Click here for more pics and to read more …

4 thoughts on “Tywyn’s Petrified Forest & The Welsh Atlantis

  1. Linda pringis

    We are currently holidaying in Wales and would like to visit Tywyn to see the petrified forest. Could you please let me know if the forest is still there before we make the journey .

    1. Paula Post author

      Linda: Unfortunately, the forest has now been reclaimed by the sands. Most of the time the forest remains covered and is only revealed when the beach is hit by storms.

  2. Kerry

    Saw the petrified forest at Tywan beach today as we went for a walk from Aberdovey to Tywyn
    Amazing to see it and touch it

  3. Hilary Rowlands

    It’s visible for much of December, January and February, and by March it starts to cover over again . It was discovered much earlier . We remember it as kids and I was born and bred in the 1970’s. I was “rock pooling” in them as late as March snd April last year as summer came early and the shrimp came out to play . Last year’s uncovering also showed the clay beds as well as the peat . Remember not to attempt to walk on the clay beds unless you want a new hip …..very slippery ! 😁 hope this helps .


Leave a Reply

Your email address will not be published.