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The geology of Barbuda, a low-lying island in the Lesser Antilles, is reexamined and the stratigraphy is revised. The oldest rocks are limestones of the Highlands Formation, a Middle Miocene accumulation of fore-reef facies. This is overlain successively by the Pleistocene Beazer and Codrington Formations, limestone accumulations of reefal, lagoonal and dune facies. The Holocene Palmetto Point Formation is comprised of extensive beach ridge and dune limestones. From this, the Barbuda Bank (which includes Antigua) is considered to have had a geological history like the neighbouring Anguilla and Guadeloupe Banks.