Hewson, 1977). The laboratory procedures used were those outlined in the two previous lists (R, 1976, v 18, p 16; 1977, v 19, p 143).Antler anti bone samples were demineralized with 1 N hydrochloric acid at about 20°C to provide pure collagen for 14C age measurement; charcoal samples were pretreated by prolonged boiling in dilute hydrochloric acid. The highly calcareous environment in which these materials had been buried precluded contamination by liumic acids and no pretreatment with alkali was needed.The dates are expressed in radiocarbon years relative to AD 1950, based on the Libby half-life for 7'C of 5570 years, and are corrected for isotopic fractionation (b13C values are relative to PDB). No corrections have been made for natural 14C variations. The modern reference standard was NBS oxalic acid. Errors are based on counting statistics alone and are equivalent to ± 1 standard deviation (± b).The British Museum excavation at Grime's Graves from [1972][1973][1974][1975][1976] has provided a unique opportunity for interdisciplinary study of the problems of dating a large prehistoric industrial site by the radiocarbon method. Previous excavations (Clarke, 1915;Greenwell, 1871) had shown that picks made from the antlers of red deer (Cervus elaphus) were used by the prehistoric miners at Grime's Graves as at other flint mines in S England. The picks were preserved in large numbers in the chalk fill of galleries, shafts and other workings. A number of picks from the excavations of A L Armstrong, who worked at Grime's Graves between ca 1920 and the mid-1930's, were held in the Museum's collections. These and well-provenanced specimens from other archaeologic excavations had already been used to provide a general framework of 17 radiocarbon dates for Grime's Graves and flint mines on the S coast of England Dates obtained over part of the same period for archaeologic sites other than Grime's Graves formed the previous two lists, British Museum VIII and IX; further dates for other sites obtained during this time will form the next two lists, British Museum XI and XII.