One block in the centre of this photo shows drill holes where it was either quarried or split.
The material came exclusively from seven or nine small quarry pits in the creek gully which now makes up the Timaru Centennial reserve 300 metres to the North of the reservoir site.
Lava (basalt) from Mt Horrible flowed towards the East and the sea and numerous lava escarpments tower over the creeks and streams running seaward off Mt Horrible. In general, this basalt is columnar crystaline and deeply cracked and weathered making it suitable for quarrying without the need for explosives. In some cases the columns are of very large diameter and rock from these quarries finds use as river and ocean protection works and in other cases the columns are about 400mm "round" These columns will have been sought for lining this reservoir as they require less input to get them to useable size.
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Photo taken in Centennial Park, Otipua Creek 7974, New Zealand
Misplaced? Suggest new location