An ‘island’ of older rocks completely surrounded by younger rocks. Related Articles: Palaeontology and caves in JamaicaRival theories by English amateurs: Matley, Trechmann and the geological origin of JamaicaThe disparids: Weird and weedy crinoids of the PalaeozoicJamaica’s geodiversity (Part 1): Introduction and some older highlights (Cretaceous to Miocene)« Back to Glossary Index