Table 3.

Absolute and relative frequencies of artefact concentrations throughout the excavated gravel sequence. Data are from both trenches combined, as measured from the surface of the main gravel mass. Note that the associated sediment layers are here for reference and do not perfectly align with the depth increments.

depth (cm)	no. artefacts	%	associated layer
0–10	22	8.76	upper main gravel
10–20	10	3.98
20–30	21	8.37
30–40	19	7.57
40–50	41	16.33
50–60	17	6.77	intermediate coarse flint
60–70	5	1.99
70–80	4	1.59
80–90	10	3.98	sand layer
90–100	14	5.58	lower main gravel
100–110	16	6.37
110–120	31	12.35
120–130	19	7.57
130–140	16	6.37
140–150	6	2.39
total	251	100