THE island of Barbados occupies a position of exceptional geographical and geological interest in the West Indian region. Geographically, this island lies outside the festoon chain of the Lesser Antilles and stands isolated as an eastern outpost projecting into the Atlantic. Geologically, it differs in structure and to some extent in the character of its rocks from its neighbours. It is, therefore, important that as much as possible of its geological history should be known. Unfortunately, the Scotland Beds, the oldest formation exposed, are no older than Eocene, and it was with the object of attempting to obtain a clue to the nature of the pre-Tertiary basement that the investigation recorded in these notes was made.