Obsidian hydration dating
For sites producing obsidian or other natural glasses this has been rivalled during the past decade by obsidian hydration dating.
Although this demands careful attention to the conditions on particular sites, it is capable of yielding accurate dates in the range 1 000 000 to 200 BP.
more A complete obsidian biface was recovered along the Kern River on the Rio Bravo Ranch near Bakersfield, California. The biface was transported from the Coso Volcanic Field over the Sierra Nevada during a period of peak obsidian biface productionand intensive trans-Sierran obsidian export and exchange. more The early seafaring prior to the Neolithic (ca. However, current evidence from systematic research in different parts of the Aegean started gradually changing this picture and opened up new dynamics for understanding the character of exploitation and the importance of early coastal and island environments; see the example of Crete (KOPAKA and MATZANAS 2009; STRASSER et al. The main source of information for these early visits on the island of Melos comes from Franchthi cave in the Argolid.
X-ray fluorescence (XRF) trace element analysis placed the artifact 130kilometers from its toolstone source at the West Sugarloaf obsidian subsource at the Coso Volcanic Field. Introduction The early seafaring prior to the Neolithic (ca. 7th millennium BC) constitutes a controversial issue in Aegean archaeology and generally in the Mediterranean (SAMPSON et al. 2010), the new site of Ouriakos on the island of Lemnos (dated according to preliminary evidence to the end of the Pleistocene and possibly to the beginning of the Holocene ca. Provenance studies of the material from this site indicated its Melian origin but obsidian hydration dating was not applied to the artefacts recovered.
Same lab, same spectrometer, same reference collection, same services, new director.
(2011), and employ the novel SIMS technique and SIMS-SS method (Fig.The calculated ages of the Borden artifacts are consistent with their discovery on landforms associated with Younger Dryas and very early Holocene wetlands.Our research results also suggest that Clovis technology may have persisted longer in California than it did in the southeastern, central, and southwestern United States.Long-term (60–360 days) hydration sequences at 90 °C show a time dependence for the mass uptake of molecular water that forms the hydration layer.The structural water concentration of the unhydrated bulk obsidian is highly correlated with the pre-exponential and activation energy and may be used to estimate the Arrhenius constants.