Table 1. Summary statistics for each site.

IQR, interquartile range.

		Durrington Walls	Mount Pleasant	WKPE	Marden	All
87Sr/86Sr	n	89	18	16	8	131
	Median	0.7094	0.7097	0.7095	0.7110	0.7095
	Range	0.7080–0.7172	0.7082–0.7113	0.7082–0.7133	0.7086–0.7166	0.7080–0.7172
	IQR	0.0015	0.0017	0.0026	0.0034	0.0017
	Mean	0.7098	0.7098	0.7101	0.7120	0.7099
	1 SD	0.0016	0.0010	0.0017	0.0027	0.0017
δ18OVSMOW (‰)	n	89	18	16	8	131
	Median	25.9	24.6	25.7	25.1	25.8
	Range	23.6–27.7	23.2–28.9	24.4–27.6	23.2–27.4	23.2–28.9
	IQR	1.27	1.58	1.23	1.97	1.38
	Mean	25.9	25.0	25.7	25.1	25.7
	1 SD	0.9	1.4	0.9	1.4	1.1
δ34SVCDT (‰)	n	86	16	15	6	123
	Median	11.9	14.8	14.6	9.1	13.0
	Range	−1.6–19.6	2.8–18.8	6.9–17.5	6.5–13	−1.6–19.6
	IQR	5.7	2.0	5.4	4.2	5.8
	Mean	11.1	14.1	13.2	9.4	11.7
	1 SD	3.9	4.2	3.3	2.7	4.0
δ13CVPDB (‰)	n	89	18	16	8	131
	Median	−20.7	−21.6	−21.4	−21.4	−21.0
	Range	−21.3–−19.7	−23.1–−20.9	−22.4–−20.6	−22.0–−20.3	−23.1–−19.7
	IQR	0.78	0.55	0.51	0.5	0.90
	Mean	−20.7	−21.7	−21.3	−21.4	−21.0
	1 SD	0.52	0.92	1.05	0.54	0.64
δ15NAIR (‰)	n	89	18	16	8	131
	Median	6.6	6.6	6.0	6.0	6.5
	Range	5.2–8.0	4.5–9.1	3.4–7.2	5.1–6.8	3.4–9.1
	IQR	0.78	0.55	0.51	0.50	0.89
	Mean	6.6	6.8	6.2	5.7	6.5
	1 SD	0.63	0.92	1.10	0.65	0.79