eolith noun.
['i:ǝ(ʊ)lɪƟ] L19.[from EO- + -LITH.]Archaeology. Any of the roughly chipped stones found in Tertiary strata and orig. thought to be the earliest human artefacts, but now regarded as naturally formed;
loosely any apparent artefact of natural origin.
[TahlilGaran] English Dictionary ▲