The volcano is constructed atop an upfaulted block of Mesozoic marine sediments.
2.
This second set of earth movements, known as the Kaikoura Orogeny, elevated large fault-bounded blocks to form the horsts ( upfaulted blocks of land ) of the Hunua and Coromandel Ranges, and threw down the grabens ( down-faulted blocks ) of the Firth of Thames and Hauraki Gulf which Omana now overlooks.
मोबाइल