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The story of the discovery of the Frome hoard and the subsequent events has been covered in a growing number of publications and in the media and as a consequence the following is a just brief resume. The hoard was found by metal detectorist Dave Crisp on Apr 11, 2010. Two days before Mr Crisp had begun finding late 4th century silver siliquae from a scattered hoard (quite possibly additional coins from a hoard found in 1867). It was while searching for these that he had a doubtful response on his detector which under normal circumstances he would probably have ignored. However, in the circumstances he decided to investigate. In the process he recovered some sherds of Roman pottery and 3rd century radiates. It was clearly a hoard. He then made one of the hardest decisions in his life but one that was crucial in enabling maximum information to be obtained from the discovery. He left everything in situ, went back to his home in Wiltshire and reported the find to Katie Hinds, his then Finds Liaison Officer. Word was quickly passed to Somerset and an archaeological excavation was organized lasting three days.

Pottery is one of the most commonly recovered artefacts from archaeological sites. Despite more than a century of relative dating based on typology and seriation 1 , accurate dating of pottery using the radiocarbon dating method has proven extremely challenging owing to the limited survival of organic temper and unreliability of visible residues 2 – 4 . Here we report a method to directly date archaeological pottery based on accelerator mass spectrometry analysis of 14 C in absorbed food residues using palmitic (C 16:0 ) and stearic (C 18:0 ) fatty acids purified by preparative gas chromatography 5 – 8 . We present accurate compound-specific radiocarbon determinations of lipids extracted from pottery vessels, which were rigorously evaluated by comparison with dendrochronological dates 9 , 10 and inclusion in site and regional chronologies that contained previously determined radiocarbon dates on other materials 11 – 15 . Notably, the compound-specific dates from each of the C 16:0 and C 18:0 fatty acids in pottery vessels provide an internal quality control of the results 6 and are entirely compatible with dates for other commonly dated materials. Accurate radiocarbon dating of pottery vessels can reveal: (1) the period of use of pottery; (2) the antiquity of organic residues, including when specific foodstuffs were exploited; (3) the chronology of sites in the absence of traditionally datable materials; and (4) direct verification of pottery typochronologies. Here we used the method to date the exploitation of dairy and carcass products in Neolithic vessels from Britain, Anatolia, central and western Europe, and Saharan Africa. Using lipid residues absorbed in potsherds, the ages of pottery from various archaeological sites are determined and validated using sites for which the dates are well known from other methods.

Pottery is one of the most commonly recovered artefacts from archaeological sites. Despite more than a century of relative dating based on typology and seriation , accurate dating of pottery using the radiocarbon dating method has proven extremely challenging owing to the limited survival of organic temper and unreliability of visible residues . Here we report a method to directly date archaeological pottery based on accelerator mass spectrometry analysis of C in absorbed food residues using palmitic (C ) and stearic (C ) fatty acids purified by preparative gas chromatography . We present accurate compound-specific radiocarbon determinations of lipids extracted from pottery vessels, which were rigorously evaluated by comparison with dendrochronological dates and inclusion in site and regional chronologies that contained previously determined radiocarbon dates on other materials . Notably, the compound-specific dates from each of the C and C fatty acids in pottery vessels provide an internal quality control of the results and are entirely compatible with dates for other commonly dated materials. Accurate radiocarbon dating of pottery vessels can reveal: (1) the period of use of pottery; (2) the antiquity of organic residues, including when specific foodstuffs were exploited; (3) the chronology of sites in the absence of traditionally datable materials; and (4) direct verification of pottery typochronologies. Here we used the method to date the exploitation of dairy and carcass products in Neolithic vessels from Britain, Anatolia, central and western Europe, and Saharan Africa.