This map illustrates the history of volcanic eruptions on the island of Fogo. "On the western slope of the island there are differentiated types passing into basanites (nepheline basalts), tephrites, and phonolites, on the salic side, and into some ultramafic rocks (ankaratrites, melilites) on the opposite side. No similar differentiates appear at the central cone, with the exception of a few basanites".
The publication from which this slide was made is available in Rhode Island College's special Cape Verdean collection.
