stripes
The lower part, about 600 m, of this volcanic structure is represented by pyroxene and olivine and pyroxene and analcime-bearing basalts, hyalobasalts and andesites which are interbedded with tuffs and tuff breccias. The structure is also cut by dykes and sheets of teschenite, crinanite and trachydolerite. Ignimbrites of liparitic and dacitic composition, and occasionally andesitic, alternate with tuffs. The alkaline gabbroic rocks contain plagioclase of basic composition, titanaugite, barkevikite and analcime. A little olivine occurs in the crinanites.
BELYI, V.F. and MIGOVICH, I.M. 1966. Cenozoic volcanic formations in the Chukotka and Koryak highland. In Volcanic and volcano-plutonic formations. 83-92. Nauka, Moscow.
LYCHAGIN, P.P. 1982. Alkali basic rocks in the North-East of the USSR. Pacific Geology 6: 85-93.