Glossary radiometric dating
Under great heat and pressure, rocks were completely changed and regrouped into new minerals.Sandstones and mudstones, for example, became schist, known for the parallel layering of minerals like mica, giving it a shimmering, silvery surface.The zones in New Zealand are defined by trenches in the north and in the south and by the Alpine Fault which connects the two.This plate boundary has shaped the size of New Zealand and also defines its geology.The islands forming New Zealand developed as part of a broader ): 1.The early sedimentation depositional phase, Cambrian to Devonian period (about 545 to 370 million years) This was the period when the earliest major recorded rock formation was taking place, with the oldest rocks being found on the west coast of the South Island., chronos, "time") is a historical account of facts and events ranged in chronological order, as in a time line.Typically, equal weight is given for historically important events and local events, the purpose being the recording of events that occurred, seen from the perspective of the chronicler.
If the chronicles deal with events year by year, they are often called annals.
The collision of these plates caused the Pacific plate to subduct underneath the Australian plate which carries the North Island.
To the south of the South Island, the situation is reversed.
Plutonic intrusions formed granite and in some places diorite.
The exact mountain building details are not known as materials got deformed, eroded or covered by younger material, but it can be presumed that all these activities happened along the former coast of Gondwana, long before New Zealand existed. The New Zealand Geosyncline, Carboniferous to Jurassic period (about 330 to 142 million years ago) During this time enormous thicknesses of sediment accumulated, extending northwest from New Zealand to New Caledonia and south far below the South Island.