 This is a bit of context, I'm sure everybody knows where is Corsica, but for this presentation it's important to have in mind that it's an island very close to La Linna and Italy, and that geographically it's mostly a montagne area, there is only a few coastal plains and geographically we are in a magmatic island, so the two-thirds of the island are made of magmatic rocks and the other third is made of various of metamorphic rocks and the people who use materials can be found only in the magmatic parts of the island so all these parts and these materials are mostly realites or crots, there is no chute, no obsidian in Corsica, so the rocks that I'm interested in are realites, it's Siliceus volcanic rock, a very fine grain and it can be found in Corsica with quite discreet dyes along the battleite of granite, so this material is interesting because we can find realites on everybody in the native sites in Corsica and the origin of exogenous materials have been studied for a long time in Corsica like chute and obsidian and we know that for a long time now that almost all these materials come from the neighboring Salina but a little know is a little, we know only a little about the local lithic materials and like crots and realites and these materials can provide another type of information on more local and regional scales so previously the characterization of realites in Corsica have been done by petrography and visual identification which can be destructive and is probably not really precise geographically so we tried a new way to characterize those materials which is with geochemistry and basically we are adapting protocols that have been used with obsidian for a long time so we can define a geochemical footprint for each deposit, it's non-destructive because we are using x-ray fluorescence analysis, I will not talk about technical aspect in this presentation but there is an article about it if you're interested in but unlike obsidians realites are very heterogeneous and there is many potential sources which can be a real problem because that's what it looks when I plot all my geological source with their mechanical concentration so it's completely messy as a first look but in fact I will show with a few examples that I can I can find the origin of some artifacts and geological sites so I will start with two sites from early Neolithic that are still under study so it's the first approach and the third site from late Neolithic is completely over so it will be a good idea of what we can really know with this kind of studies so the first site is Renage, Renage is a site in the south of Corsica here and all the realites that have been found in the site are exploited from two local sources and there is only a few pieces that come from the river and what is interesting is that there is a few pieces that come from this region in the north which is today by road something like more than 200 kilometers and so there is a correspondence with with geological pieces that have been found in this region and also with tools that have been found in Apetra which is another early Neolithic site and in Apetra we found we have only studies a part of the late Xavi it's not even a hundred but a series like five thousand realites and on what we have seen there is no cortex river no river cortex there is only realites that have been typically mined on primary sources and what is interesting is that there is no local sources they have been searching for realites in the mountainous area of the Montechinto here and unlike in Renage there is no correspondence with artifacts from this part of Corsica so there is realites that come from the north to the south but there is no realites that come from the south to the north and the site that is completely done now it's Monte Parbat it's a late Neolithic to Middle Bronze settlement in south of Corsica it's a site on a hilltop just over there and there is a nice view on the sea on the first side and the other side view on all the mountains and when we plot all the realites that have been analyzed on this site we can see at first site that there is 16 groups of composition which mean at least 16 different geological sources and we can find some correspondence with the sources that we have on our geological referential so most of these realites come from a local sources which is less than one kilometer away it's the kind of realites and there is also realites that come from Pastini which is a source near the site of Renage and also from north Corsica still the same area of the Monte Chinto so there is some correspondence with Artifact on other sites too because even if we don't have all the geological sources we can build links between sites, archaeological sites, so there is the same sources used in Renage, Icaranchi which is a calcolithic site really near of Monte Babac and sometimes we don't have the actual geological sources but only with the chemical concentration or by looking to the cortex or the kind of things we can have we can still have an idea of the provenance of the artifact so when I put this information on the map I can see that there is a diffusion from the Pastini Pato which is new because we didn't we didn't know that these sources diffuse in Corsica and we can see that all the sources are situated on the west coast of Corsica and there is nothing in the mainland even if we know that there is a lot of potential sources of realites there so I think there is maybe a coastal axis of diffusion that is that going from Sardinia to maybe Italy and the passing between the coast of Corsica because there is of course other materials than realites on the site and there is a lot of of obsidian that come from Monte Archi then some flint from Montefel and Perfogas and after that Pastini from realites the archaeological site the Chinto and Fombo Valley in the northwest from realites and after that we know that obsidian can go to the south of France or even more far away in Spain so in conclusion we can we have we can verify that the the methodology that is is working and is well established it just start with archaeological analysis so I spend a lot of time by building my protocol analytical protocol and I just start the analysis of archaeological data so it's just some new data some first data but we can see that there is a probable problem coastal diffusion and a different land use between north and south because like something more mountainous in the north and more coastal in the south and it's interesting to see that the sources that have been found in the old linearities are still in use in the light magnetic so they probably found most of the sources in the future generations and it's interesting to integrate the study of realites with the study of church and obsidian of course because it's probably the same distribution network we'll have to check about technology too and it can provide a better definition a more local definition of an already well known action system between Goss Vicar, Sardinia and the mainland but of course there is still a lot of work to do a new archaeological site to investigate new lithics theory and there is still a lot of unknown geological sources and the work to do with geological sources is probably something like a decay is a fault before there is everything now so thank you