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They are largely composed of Greywacke ( hardened sandstone and mudstone ) , but also contain Chert , and Pillow lava s. In the Wellington Region , the Torlesse Composite Terrane is composed of two subterranes , the Rakaia Terrane ( late Triassic to early Jurassic , 230-180 Ma ) , to the west of the Ruahine Ranges , and the Pahau Terrane ( late Jurassic to early Cretaceous , 180-100 Ma ) , to the east .
 Wellington Region
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Wellington Region