Table 1 Radiocarbon dates from Clovis sites.

SiteDateCalibrated dateLaboratory numberMaterial datedRemarks
14C yr B.P.cal yr B.P.*
Lange-Ferguson, SD11,110 ± 4013,095–12,990UCIAMS-11345Mammoth bone (XAD)
Dent, CO11,065 ± 3513,075–12,930UCIAMS-11339Mammoth bone (XAD)
10,940 ± 3012,885–12,770UCIAMS-11340Mammoth bone (XAD)
10,960 ± 3512,905–12,780UCIAMS-116403Mammoth bone (XAD)
11,055 ± 5013,070–12,925OxA-X-2736-11Mammoth bone
(hydroxyproline)
11,155 ± 5013,160–13,005OxA-X-2736-12Mammoth bone
(hydroxyproline)
Average11,010 ± 1512,970–12,845
Domebo, OK10,960 ± 3012,905–12,820UCIAMS-11341Mammoth bone (XAD)
Shawnee-Minisink, PA10,940 ± 9012,960–12,755Beta-101935Carbonized Hawthorn
seed (Crataegus)
Hearth
10,900 ± 4012,830–12,760Beta-127162Carbonized Hawthorn
seed (Crataegus)
Hearth
10,820 ± 5012,815–12,730Beta-203865Carbonized Hawthorn
seed (Crataegus)
Hearth
10,915 ± 2512,830–12,770UCIAMS-24865Carbonized Hawthorn
seed (Crataegus)
Hearth
11,020 ± 3013,050–12,850UCIAMS-24866Carbonized Hawthorn
seed (Crataegus)
Hearth
10,970 ± 5012,925–12,770OxA-1731Carbonized Hawthorn
seed (Crataegus)
Hearth
Average10,940 ± 1512,885–12,770
Sheriden Cave, OH10,915 ± 3012,830–12,770UCIAMS-38249Bone (XAD)Bone point
La Prele, WY11,035 ± 5013,065–12,900OxA-X-2736-14Mammoth bone
(hydroxyproline)
10,965 ± 3012,910–12,825UCIAMS-206764Mammoth bone (XAD)
Average10,985 ± 2512,915–12,835
Colby, WY10,790 ± 3012,750–12,735UCIAMS-11342Mammoth bone (XAD)Bone pile 2
10,950 ± 3012,895–12,775UCIAMS-11343Mammoth bone (XAD)Bone pile 2
Average10,870 ± 2012,820–12,800
Jake Bluff, OK10,750 ± 4012,745–12,720CAMS-79940Bison tooth (XAD)
10,840 ± 4512,820–12,735CAMS-90968Bison bone (XAD)
10,700 ± 4512,735–12,690CAMS-90969Bison bone (XAD)
10,810 ± 2512,755–12,740UCIAMS-61657Bison bone (XAD)
10,885 ± 3512,820–12,760UCIAMS-59874Bison bone (XAD)
Average10,820 ± 1012,755–12,745
Anzick, MT10,915 ± 5012,880–12,760OxA-X-2739-54Human bone
(hydroxyproline)
Anzick-1 cranium
11,025 ± 3013,055–12,895UCIAMS-61661Elk (XAD)Foreshaft
10,900 ± 5012,835–12,755OxA-X-2739-55Elk (hydroxyproline)Foreshaft
11,050 ± 5513,070–12,920OxA-X-2739-56Elk (hydroxyproline)Foreshaft
Average10,985 ± 2012,905–12,840
Cactus Hill, VA10,860 ± 6012,825–12,745Beta-266341CharcoalHearth
10,840 ± 4012,820–12,740Beta-206060CharcoalHearth
10,810 ± 4012,760–12,730Beta-233642CharcoalHearth
10,890 ± 4012,825–12,760Beta-233643CharcoalHearth
10,910 ± 4012,835–12,760Beta-210651CharcoalHearth
Average10,860 ± 2012,820–12,745

*Ages calibrated using IntCal20, Calib 8.1 (9).