However, his lawyer John Ross said it was an honest mistake rather than a deliberate or reckless act.
His client enjoyed a warm relationship with Maori and was an honest and hardworking businessman, he submitted.
Mr Ross said damage to the pa site was minor and submitted that the Whangarei District Council website and GIS maps in respect of the archaeological site were confusing.
Judge Davis said work that Cowley did was on land around the archaeological site and that the damaged middens were not recorded on the New Zealand archaeological site.
Because of that, he said, Cowley's actions were neither deliberate nor reckless.
On April 29, 2010 an employee of the Ngati Wai Trust Board, Clive Stone, reported to the trust that a road had been built over an archaeological pa site and that substantial site damage had been done. Cowley's property straddles a series of important landmarks for Maori that stretch from Te Whara/Bream Head on the East Coast to Ripiro Beach on the West Coast.
On April 30, 2010, officials from the trust and Ngati Wai visited the site and determined that tracks had been cut on the property using earthmoving equipment that had disturbed middens.