The Honolulu volcanic series is a set of volcanic events on the Hawaiian

Hawaiian

Hawaiian may refer to:* People from Hawaii* Hawaiian language* Native Hawaiians* The Hawaiians, a football team in the World Football League from 1974 to 1975* Hawaiian Airlines, a commercial airline* Hawaiian music...

 island of Oahu

Oahu

Oahu or Oahu , known as "The Gathering Place", is the third largest of the Hawaiian Islands and most populous of the islands in the U.S. state of Hawaii. The state capital Honolulu is located on the southeast coast...

. The events, which have been dated to between 800,000 and 30,000 years before the present, created several notable island features, including Diamond Head

Diamond Head

Diamond Head may refer to:* Diamond Head, Hawaii, a volcanic cone on the Hawaiian island of O'ahu known to Hawaiians as Leahi* Diamond Head , a song by the Beach Boys from their 1968 album Friends...

, the Punchbowl Crater

Punchbowl Crater

Punchbowl Crater is an extinct volcanic tuff cone located in Honolulu, Hawaii. It is the location of the National Memorial Cemetery of the Pacific....

, and Hanauma Bay

Hanauma Bay

Hanauma is a marine embayment formed within a volcanic cone and located along the southeast coast of the Island of Oahu in the Hawaiian Islands....

.

The composition of this volcanic outflow is significantly different from that of the older eruptions that created most of the island.