Hi Sifaka.

Have a feeling your question has been asked before on TMA but can't remember the name of the thread. The only novel on a Neolithic theme that springs to mind is Moyra Caldecott's Guardians of the Tall Stones (ISBN 0-89087-463-8). There are probably more novels (as well as films) out there that other folk on TMA might be able to help you with.

As for poems on a Neolithic/Megalithic theme you don't have to go far - just scroll down this page until you reach the Megalithic Poems thread - happy reading :-)