A monthly field lecture series will take participants back to a time when Kawainui Marsh and Ka'elepulu Pond were ocean bays and the first Polynesians came to the shores of Kawainui Lagoon and built heiau, a fishpond and taro terraces.

Ahahui Malama I Ka Lokahi and the Kailua Hawaiian Civic Club begin their Fall Kawainui Marsh Educational Series at 8:30 a.m. Saturday at Ulupo Heiau.

Chuck "Doc" Burrows, a Hawaiian naturalist, will lead the tour and explain how the sites were used.

Next month, on Oct. 3, geologist Floyd McCoy will lead a geology tour of the area.

To register or for more information, visit www.ahahui.net or call Kaimi Scudder at 593-0112. A $5 donation is requested.