If there is a natural heritage that is most often ignored by walkers, it is the geological heritage. We live on it, our houses are seated there, we see rocks at low tide, cliffs, sea caves and quarries all along the coast. But who really pays attention to it?
And yet it is a natural heritage that is sometimes extremely important. If everyone has heard of the Pink Granite Coast around Trégastel, who knows the granite of Aber Ildut ? It is one of the most beautiful in France and can be admired in Paris on the Place de la Concorde as well as in the Pays d'Iroise in Kerglonou, opposite Lanildut.
There is often talk in middle and high schools, as well as on TV, about continental drift or, if you prefer, plate tectonics. And the formation of the Atlantic Ocean 170 million years ago is still cited as an example. But do you know that you can still see the trace of it on the cliffs of the Pays d'Iroise ? And do young people today know that the lakes of St-Renan are former cassiterite quarries that made this city the European tin capital ?
We must take the time to observe the rocks, to look for tiny garnets or fossils, to admire the strata, the quartz veins, and, by thinking, extend towards the sky these almost vertical rocks which seem to indicate the summit where once, a very long time ago, the high Armorican mountains culminated.
As far as walkers are concerned, stopping to observe is a necessary act to understand environment. Because it is through observation that knowledge and science have always started.