21. During glacial periods more of Zealandia became a terrestrial rather than a marine environment. 22. The prairies are a contribution of the glacial period . 23. During the dryer glacial periods the area was arid. 24. The last glacial period of the current ice age ended about 10, 000 years ago. 25. During the glacial periods the limits of the permanent snow cover were at 2200 m. 26. The park is known for producing myriad mammal fossils dating from the last glacial period . 27. In the cooler glacial periods , this was replaced by rain forests prevalent in drier climes. 28. After the last glacial period , the warmer climate allowed the area to become heavily wooded. 29. These consisting of glacial periods where conditions are colder than normal, separated by interglacial periods. 30. The site exposes a succession of Pleistocene levels, with an interglacial between two glacial periods .
