Volcanic rocks, undivided, basalt and andesite (Tertiary, Eocene and older?
5100Qs – Undifferentiated surficial deposits (Quaternary) 5105Qa – Alluvium (Quaternary) 5106Qaf – Alluvial fan deposits (Quaternary) 5107Qc – Colluvial deposits (Quaternary) 5108Qls – Landslide deposits (Quaternary) 5110Qt – Terrace deposits (Quaternary) 5111Qac – Abandoned channel deposits (Quaternary) 5112Ql – Lacustrine deposits (Quaternary) 5113Qsw – Swamp deposits (Quaternary) 5120Qd – Eolian sand (Quaternary) 5125Qm – Glacial deposits (Quaternary) 5128Qsf – Solifluction deposits (Quaternary) 5129Qme – Esker deposits (Quaternary) 5135Qmbu – Undifferentiated glacial deposits of the Brooks Lake glaciation (Quaternary) 5139Qmbk – Brooks Lake, Kvichak moraine (Quaternary) 5140Qmbo – Outwash deposits of the Brooks Lake glaciation (Quaternary) 5166TKgs – Granitic rocks of the eastern Stuyahok Hills (Tertiary and Cretaceous) 5167TKpsw – Plutons of the Pike Creek area, southwestern unit (Tertiary and Cretaceous) 5168TKga – Alaskite (Tertiary and Cretaceous) 5169TKpe – Plutons of the Pike