O significado da pedra deve ser que Peter Jackson achou legal. Não há menção disso no livro.
Barbárvore conta a Merry e Pippin que o Entmoot se encontra em Derndingle (o nome é inglês arcaico, que significa "vale secreto").
‘Where is Entmoot?’ Pippin ventured to ask.
‘Hoo, eh? Entmoot?’ said Treebeard, turning round. ‘It is not a place, it is a gathering of Ents – which does not often happen nowadays. But I have managed to make a fair number promise to come. We shall meet in the place where we have always met: Derndingle Men call it. It is away south from here. We must be there before noon.’
The Two Towers: Treebeard
Quando chegam a Derndingle, lemos:
The hobbits saw that they were descending into a great dingle, almost as round as a bowl, very wide and deep, crowned at the rim with the high dark evergreen hedge. It was smooth and grassclad inside, and there were no trees except three very tall and beautiful silver-birches that stood at the bottom of the bowl.
The Two Towers: Treebeard
Nenhuma pedra é mencionada, embora Jackson pudesse argumentar que isso era apenas um descuido.