Volynets and others (1994) describe these submarine peaks, ~15 miles north of Carlisle, as eroded volcanic cones (?), and state that they seem to be of
Pleistocene age. Dredge samples of these peaks (V38-27, -28, and -29) returned
basalt, in addition to probably exotic blocks and fragments of paleotyal
lava, diorite, metasediments, sediments, and sedimentary rocks.