Further to Kevan Marks' letter entitled Many Questions (Advocate 14/01/2015) regarding destruction of evidence of pre-Maori occupancy of NZ:
It is unsurprising that authorities are not being advised of new discoveries until fully documented photographs and carbon dating of artifacts have been established.
Why? Because the immediate "official" response is to bulldoze the site, impose a 75 year embargo on the region, or advise local iwi who rapidly declare the area sacred to prevent further investigation.
There are more than 100 such embargoed sites in NZ. Yes, Kevan, what don't they want us to know?
I have just viewed one website with photographs of an immense earthen pyramid, stone walls extending for miles, and religious cairns in Northland. Artifacts on this site have been carbon-dated at around 5000 years old.