WordNet (r) 3.0 (2006):

eolith
    n 1: a crude stone artifact (as a chipped flint); possibly the
         earliest tools

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "eolith":
   ancient manuscript, antique, antiquity, archaism, artifact,
   cave painting, fossil, mezzolith, microlith, neolith, paleolith,
   petrification, petrified forest, petrified wood, petroglyph,
   plateaulith, relic, reliquiae, remains, ruin, ruins, survival,
   vestige