This isn’t the creme de la creme of geology papers in my opinion, but i enjoyed it regardless.
Lava flows and sills of basaltic habit make up the bulk of St. Paul island. Some individual flows seem to merge into each other, but in many places they can be distinguished and thicknesses from 10 to 7 yards were measured; still thicker flows probably exists. Peridotite is probably the most interesting rock in St. George island. It is overlain by sills and lava flows. Aplite is intrusive into the peridotite and composite in grained granular central portion.
Here is the link. http://response.restoration.noaa.gov/book_shelf/535_prib5.pdf