Origin
The boulders in the Wairere valley are the erosional remnants of a lava flow out of a volcano near lake Omapere (near Kaikohe) that has been dated as approximately 2.8 million years old. There are two dates for these Horeke basalts: one at 2.84 and the other at 2.67 million years. There is a slight difference in chemistry in the two rocks that have been dated suggesting that the eruption took the form of several flows that once blanketed the high ground to the east of Horeke.
Read more about this topic: Horeke Basalts
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