These include nephelinite, basanite and peralkaline phonolite, trachyte and comendite lavas. Dredging has yielded basaltic rocks which define alkali basalt and basanite suites. Potassic basanite and limburgite are found in the Pleistocene layers. The field has erupted alkali basalt, basanite and hawaiite. They are composed of trachyte, trachyandesite, basalt, phonolite, basanite and to a lesser extent phonotephrite. Limalok has erupted basaltic rocks, which have been classified as alkali basalts, basanite and nephelinite. Holocene layers contain augitite, leucite basanite, potassic hawaiite and leucite tephrite. Eruption products consist chiefly of alkaline basalt and basanite. These include nephelinite, basanite and peralkaline phonolite, trachyte, and comendite lavas. The basanite to hawaiite basaltic flows contain xenoliths of peridotite. Additional rocks are basanite, mugearite, picrite and tephrite. It is a dark porphyritic variety of basanite containing abundant pyroxene and olivine phenocrysts. Lava flows of more viscous phonotephrite and trachyte erupted after the basanite. Basalt and basanite continued to erupt in the north. Additional rocks that were erupted from Berlin are basanite, hawaiite and mugearite.