The steepness gradient of most guyots is about 20 degrees. It features many coral-capped guyots. Previous islands now beneath the sea (guyots) form the Emperor Seamount Chain. The western area has numerous guyots and seamounts and a basement dated to . Volcanic structures in this ridge include guyots, islands and seamounts. The first are guyots, seamounts with a flat top. These flat-topped seamounts are called guyots. The greater the amount of time that passes, the deeper the guyots become. Guyots are also associated with specific lifeforms and varying amounts of organic matter.