Table 1.

Sample details and ⁸⁷Sr/⁸⁶Sr values of the ostrich eggshell beads from Melikane and Sehonghong rock-shelters analyzed in this study

Sample ID	Site	Layer	Age (kcal BP)	Stage	87Sr/86Sr	2SE±	2SE± (%)
SF-4	Melikane	1	0.3–0.15	Late Holocene	0.713080	0.000017	0.0023
SF-10	Melikane	2	3.3–0.15	Late Holocene	0.713242	0.000016	0.0016
SF-13	Melikane	2	3.3–0.15	Late Holocene	0.714967	0.000016	0.0016
SF-20	Melikane	2	3.3–0.15	Late Holocene	0.717149	0.000014	0.0020
SF-29	Melikane	2	3.3–0.15	Late Holocene	0.715892	0.000014	0.0020
SF-43	Melikane	2	3.3–0.15	Late Holocene	0.715753	0.000014	0.0019
SF-48	Melikane	2	3.3–0.15	Late Holocene	0.714822	0.000013	0.0018
SF-56	Melikane	2	3.3–0.15	Late Holocene	0.713849	0.000012	0.0017
SF-70	Melikane	2	3.3–0.15	Late Holocene	0.719894	0.000019	0.0026
SF-87	Melikane	2	3.3–0.15	Late Holocene	0.713054	0.000015	0.0021
SF-90	Melikane	2	3.3–0.15	Late Holocene	0.716775	0.000014	0.0019
SF-86	Sehonghong	DC	1.26–0.98	Late Holocene	0.715509	0.000013	0.0018
SF-101	Sehonghong	DC	1.26–0.98	Late Holocene	0.713296	0.000013	0.0017
J12-11B	Sehonghong	DC	1.26–0.98	Late Holocene	0.714032	0.000012	0.0016
J12-11C	Sehonghong	DC	1.26–0.98	Late Holocene	0.713137	0.000014	0.0019
SF-691	Sehonghong	DC	1.26–0.98	Late Holocene	0.714276	0.000014	0.0020
SF-174	Sehonghong	ALP	8.3–7.67	Early Holocene	0.716115	0.000012	0.0018
SF-231	Sehonghong	ALP	8.3–7.67	Early Holocene	0.714180	0.000013	0.0019
SF-265	Sehonghong	ALP	8.3–7.67	Early Holocene	0.714251	0.000014	0.0020
SF-267	Sehonghong	ALP	8.3–7.67	Early Holocene	0.715159	0.000018	0.0025
SF-751	Sehonghong	ALP	8.3–7.67	Early Holocene	0.716321	0.000014	0.0020
SF-430	Sehonghong	BARF	13.4–12.6	Late Pleistocene	0.755539	0.000012	0.0016
SF-430 replicate	Sehonghong	BARF	13.4–12.6	Late Pleistocene	0.755541	0.000021	0.0028
SF-1090	Sehonghong	RF	15–13.7	Late Pleistocene	0.715643	0.000015	0.0021
SF-1091	Sehonghong	RF	15–13.7	Late Pleistocene	0.714490	0.000014	0.0020
SF-1092	Sehonghong	RF	15–13.7	Late Pleistocene	0.716109	0.000012	0.0017
SF-392	Sehonghong	RBL-CRBLF	15.7–15.2	Late Pleistocene	0.712252	0.000015	0.0021
I13-170	Sehonghong	n/a	33.7–31.9	Late Pleistocene	0.718649	0.000013	0.0018

Mean value for the Sr standard NBS 987: ⁸⁷Sr/⁸⁶Sr = 0.710250 ± 0.000016 (n = 16) Finnigan MAT 262; ⁸⁷Sr/⁸⁶Sr = 0.710245 ± 0.000014 (n = 11) Thermo Scientific Triton Plus. Accepted value of McArthur et al. (75) = 0.710248. n/a, not applicable (layers currently unassigned as this portion of the Sehonghong sequence remains under excavation).