Trinidad trend containing the Lizard Springs, Navette, and Mayaro Fields, while the southern trend contains the Beach Field. Trinidad Trinidad is the larger and more populous of the two major islands of Trinidad and Tobago. The island lies off the northeastern coast of Venezuela and sits on the continental shelf of South America. Though geographically part of the South American continent, from a socio-economic standpoint it is often referred to as the southernmost island in the Caribbean. With an area of , it is also the fifth largest in the West Indies. The original name for the island in the Arawaks'
Geology of Trinidad and Tobago Geology of Trinidad and Tobago The geology of Trinidad includes two different islands with different rock forms. The oldest rocks in Trinidad are low-grade metamorphosed phyllite, limestone and quartzite from the late Jurassic. Cretaceous quartzite, phyllite, shale and limestone outcrops around the Toco district. The east of the island is the only area with volcanic rocks exposed at the surface, including basalt, ash and breccia. Phyllite shale spans the north coast. Laventille Formation limestone is associated with these rocks and contains a gypsum layer. Flysch, dark shale and quartzite deposited during the Cretaceous, followed by Naparina Hill Formation argillite. During