Editing Lithic analysis (section)

===Petrological and geochemical analysis===
Petrological and geochemical analysis can be useful in identifying the sources of lithics and assist in establishing trade and migration routes.<ref>{{cite web|last1=Driscoll|first1=Killian|title=Irish lithic landscapes macroscopic petrographic geochemical characterisation chert|url=http://www.lithicsireland.ie/archaeology_projects_irish_lithic_landscapes_chert_provenancing.html|website=lithicsireland.ie|access-date=8 April 2017}}</ref> Methods used are typical of those used in geologic research, such as [[Petrography|petrographic]] [[thin section]] analysis, [[neutron activation analysis]], [[stable isotope]] analysis, and [[X-ray fluorescence]]. One example of this application is Yellin (1996) in which neutron activation analysis was used to trace the source of obsidian artifacts found at the Gilat site in Israel.<ref>{{cite journal|last1=Yellin|first1=Joseph|last2=Thomas E.|first2=Levy|last3=Yorke M.|first3=Rowan|title=New evidence on prehistoric trade routes: the obsidian evidence from Gilat, Israel|journal=Journal of Field Archaeology|date=1996|volume=23|issue=3|pages=361–368|doi=10.1179/009346996791973873}}</ref> This investigation found that earlier obsidian was obtained from central Anatolia, but in later times, obsidian was obtained from another region in eastern Anatolia. This is used as evidence for changing trade relationships in Israel during the Chalcolithic period.