Revised lithostratigraphy of the Coastal Group of south-eastern St. Thomas, Jamaica

The lithostratigraphy of the Coastal Group (Neogene) in the south-eastern part of the parish of St. Thomas, Jamaica, is formally described based on detailed geological mapping. Four formations and two members are recognised: August Town Formation (including the Leith Hall Member (new member)); Layton Formation (reintroduced name) (including the Bowden Member); Old Pera Formation (changed rank) and Port Morant Formation (formerly introduced). Type sections for each new and upgraded formation are described. The paper presents the revised lithostratigraphy of the formations, clarifies some previous misconceptions, and places the formations into a formal nomenclature as set out by the International Stratigraphic Commission.