This material (the basalt outflow from Mt Horrible which is endemic around Timaru and visible at a number of places as lava cills) lines this reservoir. The blocks are split rough blocks mainly cubic but very variable (see pic 66199693) and have been impact fractured or split with wedge and feather. Although the basalt has no structure it will break to produce flat faces in most cases, in the hands of a good stone cutter.
Even through the haze of seeding rank pasture grasses the carefully laid blocks can be discerned. Given that the block shape and size varies (as evidenced by the harvested stone) you can see how skillfully fitted the blocks were to minimise movement after filling and contamination by clays and silt.
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Photo taken in Centennial Park, Otipua Creek 7974, New Zealand
Misplaced? Suggest new location