The geology of Saint Lucia includes exposed Miocene rocks—the most northerly in the Volcanic Caribbees section of the Lesser Antilles volcanic island arc. These rocks include calc-alkalkine and arc tholeiite igneous rocks. The oldest formed up to 18 million years ago in the north. [1]

References

  1. ^ Donovan, Steven K.; Jackson, Trevor A. (1994). Caribbean Geology: An Introduction. University of West Indies. p. 171-173.