Uplifted sea floor, Cape Cleare, Montague Island in Prince William Sound, Alaska. 1964.

Alaska Earthquake March 27, 1964. Uplifted sea floor at Cape Cleare on Montague Island in Prince William Sound in the area of the greatest recorded tectonic uplift on land (33 feet). The very gently slopping flat rocky surface with the white coating which lies between the cliffs and the water is about a quarter of a mile wide. It is a wave-cut surface that was below sea level before the earthquake. The white coating consists of the remains of calcareous marine organisms that were killed by desiccation when the wave-cut surface was lifted above high tide during the earthquake. Published in U.S. Geological Survey Professional paper 541, Figure 11, p.16. 1966.