The rocks exposed along the western coast of Arctowski Peninsula and on offshore islands, Danco Coast (West Antarctica), represent the following lithostratigraphic units: the Trinity Peninsula Group metasediments (?Permian-Triassic); the Antarctic Peninsula Volcanic Group lavas, agglomerates and tuffs (Lower Cretaceous); the Andean Intrusive Suite, including adamellite, granite, granodiorite, diorite, tonalite and gabbro plutons (mid-Cretaceous), moreover basic and acid hypabyssal dykes (?Upper Cretaceous). The relationships between these rock-units are shown in geological map and sketches of field exposures.