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We learned that it is part of the large Koolau Shield, but we aren't sure if Koko Crater itself is classified as part of a shield volcano or a separate type.

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We learned that it is part of the large Koolau Shield, but we aren't sure if Koko Crater itself is classified as part of a shield volcano or a separate type. We know that Diamond Head is a tuff cone but we are unsure about Koko Crater. Could you classiried us out on this question.

Also, if clasified could list other noteworthy volcanoes on Oahu along with its classification i. Punch- bowl we would really appreciate it. Thank you for your question.

I certainly can understand the source of some confusion on this classification scheme! Actually there are many more than three types of volcanoes, although the three you name are probably about the most common types.

Shield volcanoes typically are very large- Mauna Loa is a good example, as are other Hawaiian volcanoes active and inactive. However when they get deeply eroded, as the Koolau and Waianae shield on Oauu have, their gentle 'shield' profiles are difficult to see. Composite volcanoes are the type typically found above subduction zones near deep sea trenches at continental margins.

Cinder cones are typically much smaller than these two main types and have much simpler eruption histories. Claszified shield and composite volcanoes are OOahu active for at least several million years and are made of many, many individual eruptions and eruptive episodes, cinder cones usually form in a single eruptive episode lasting only a few weeks or possibly months.

So grouping these three types together is like grouping a basketball and a volleyball together with a pea!

They are all spherical, but On Oahu, almost all of the so-called 'rejuvinated' volcanics called the Honolulu series are cinder cones. This includes the ones you mentioned and any others with that general shape and size.

In other cases, eruptions of the Honolulu series produced isolated single flows or little mounds of flows, examples are the the flow in Manoa valley that can be seen in the old quarry on the UH campus and the Kaimuki "mound" near the Kaimuki fire station respectively.