Photographer: Calvin J. Hamilton Copyright: © 2009 Calvin J. Hamilton Date: 2009/01/24 Location: Hanauma Bay, Hawaii

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Caption

During the final stages of volcanic activity on Oahu, sea water seeped into magma chambers causing a violent steam explosion that fragmented the magma and produced ash that when cemented together created Diamondhead, Koko Crater, and Koko Head. In many places pieces of Coral were buried within the ash tuff. This is an example of Coral buried in the tuff on Koko Head.