Origin and location of Morta :
Highly mineralised, Morta is a fossil wood. Very dark, it is difficult to work with (wood loaded with silica)
Following landslides, forests were progressively buried by the oceans. These transgressions and regressions of the ocean gradually shaped the marshes. Lying in the silt deposited by the ocean, these trees slowly fossilised.
Today they are found buried in the peat. Black and spongy at the time of extraction, the Morta must dry for several months before being worked. Only 10% of a piece extracted from the marsh can be used. This is why it is so rare.
Although it is present in a large part of the Brière, Morta is still difficult to exploit because it is always buried in the peat. It is therefore necessary to wait for the dry season to be able to reach it.