Grey basalt groundstone fragment found just W of the clay basin, inset in the clayey ashy matrix that surrounds the basin on that side. 1139 g; 13.1 cm long; 12.2 cm wide; 4.3 cm in breadth. Found at 2295.405 m; 82 cm from the W baulk; and 167 cm from the S baulk.
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