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In page Geography of Trinidad and Tobago:

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The Northern Range consists mainly of Upper Jurassic and Cretaceous metamorphic rocks.[2] The Northern Lowlands (East–West Corridor and Caroni Plains) consist of younger shallow marine clastic sediments.[citation needed] South of this, the Central Range fold and thrust belt consists of Cretaceous and Eocene sedimentary rocks, with Miocene formations along the southern and eastern flanks.[citation needed] The Naparima Plains and the Nariva Swamp form the southern shoulder of this uplift.[citation needed]