on the ign maps, this dolmen is referred to as "Dolmen des Grès de Linas". To see the ign maps of the site, click on the geoportail icon, the blue aeroplane button, 2nd from right at the top of the page, then select the maps box from the top left. This then lets you zoom in to see all scales. I can add the other name as an alternate.
Something is not right. This message is just to keep things from messing up down the road