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In page Geography of Trinidad and Tobago:

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The Southern Lowlands consist of Miocene and Pliocene sands, clays, and gravels.[citation needed] These overlie oil and natural gas deposits, especially north of the Los Bajos Fault.[citation needed] The Southern Range forms the third anticlinal uplift.[citation needed] It consists of several chains of hills, most famous being the Trinity Hills.[citation needed] The rocks consist of sandstones, shales, siltstones and clays formed in the Miocene and uplifted in the Pleistocene.[citation needed] Oil sands and mud volcanoes are especially common in this area.[citation needed]