Molokai consists of two major volcanic principal parts: East Molokai volcanic series and the West Molokai volcanic series.

Report of the systematic study of the geology and ground-water resources of Lanai and Kahoolawe as part of the geological survey by United States Department of the Interior.

This publication consist of two parts exclusively covering the Island of Oahu, definted by the Koolau and Waianae ranges. Part 1 (1-198) is concerned with topics related to geology and part 2 (199-467) is concerned with topics related to ground water resources. The geology pertains to the Waianae volcanic series, Kailua volcanic series, Koolau volcanic series and the Honolulu volcanic series. The study covers climate generated water, surface water, ground water, and access to these water sources.

Reports on the domestic water supply derived from rain caught from roofs and some ground wells. Overall, the island has high aridity, unfavorable geologic structures, continuous deposition of salt spray, and abundant authigenic salts in the lake beds.