British Honduras may be briefly described as a 3,000 feet peneplain of upper Carboniferous slates, surrounded by thick dense Oligoceue and Miocene limestones. The slates have a strike of about 250° conforming to the general Central American trend, produced at the close of the Palaeozoic. Granodiorite and quartz-porphyry were intruded at this period. The newer formations with their extension through Yucatan into Western Cuba, curve from north to north-east parallel to the rim of the 2,500 fathom Yucatan basin.