Foliated, lineated, and gneissic biotite-hornblende quartz diorite and granodiorite with minor diorite exposed on southern Prince of Wales, Dall, and northern Admiralty Islands. Most rocks retain recognizable intrusive textures. The more deformed rocks have 5- to 20-cm layers of alternating leucocratic and mafic composition. In most outcrops these compositional layers are thought to be different intrusive phases; in some, however, compositional layering may have resulted from metamorphic segregation (Gehrels, 1991). The False Point Retreat pluton has U/Pb zircon ages of ~545 Ma, 546.9±3.2 Ma, and 544.08±0.84 Ma (S.M. Karl, unpub. data). Elsewhere in southeast Alaska, the Kaigani pluton on Dall Island has U/Pb zircon age of 554±4 Ma (Gehrels, 1990) and orthogneiss at Sunny Cove on Prince of Wales Island has a U/Pb zircon age between 540 Ma and 520 Ma (J.B. Saleeby, unpub. data, cited in Gehrels and others, 1987). Orthogneiss on Bronaugh Islands near Ketchikan has a U/Pb zircon age of 540–510 Ma (Gehrels and others, 1987)