# Eraillure

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In [lithic analysis](/source/lithic_analysis) (a subdivision of [archaeology](/source/archaeology)), an '''eraillure''' is a flake removed from a [lithic flake](/source/lithic_flake)'s [bulb of force](/source/bulb_of_applied_force), which is a lump left on the ventral surface of a flake after it is detached from a core of [tool stone](/source/tool_stone) during the process of [lithic reduction](/source/lithic_reduction).<ref>Hiscock, Peter. (1997).[http://arts.anu.edu.au/arcworld/resources/stonegloss/gloss.htm Glossary of Terms used in "Lithic" Analysis."] {{Webarchive|url=https://web.archive.org/web/20120112093627/http://arts.anu.edu.au/arcworld/resources/stonegloss/gloss.htm |date=2012-01-12 }} Australian National University. Retrieved 2011-12-14.</ref>  The mechanics of eraillure formation are related to the propagation of a [Hertzian cone](/source/Hertzian_cone) of force through the [cryptocrystal](/source/cryptocrystal)line matrix of the stone, but the particulars are poorly understood. Eraillures usually form only when a [hammerstone](/source/hammerstone) is used for lithic reduction, and then only occasionally; use of 'soft' hammer fabricators made from [bone](/source/bone), [antler](/source/antler), and [wood](/source/wood) produce different flake characteristics but may also produce an eraillure in rare cases.{{cn|date=December 2011}}

== See also ==
* [Stone tool](/source/Stone_tool)

== References ==
{{Reflist}}

{{Prehistoric technology}}

Category:Lithics

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