They can be misidentified easily in the subsurface as fossil offshore bars. 它们在地下深处最易于与石化了的滨外沙洲混淆起来。
Other islands that rise from offshore bars within a bay, or that from spits, commonly show the same shoreline characteristics. 海湾内由滨外沙坝形成的其它岛屿或沙嘴,通常显示同样的岸线特点。