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The crystallization age of basalt cored in Hole 315A, from the Fanning Island volcanic edifice, is 91.2 ±2.7 m.y. The fossil and KAr age data from DSDP Sites 165, 315, and 316 neither preclude nor substantiate the hypothesis that the Line Islands become younger to the south-southeast. The minimum age of basalt basement in Hole 317A is 106.0 ±3.5 m.y., and the estimated crystallization age is approximately 110 to 120 m.y. The K-Ar ages of basalt basement at Sites 315 and 317 are in reasonable agreement with the paleontologic age assigned to the overlying sediments.

K-Ar Ages of Basalts from DSDP Leg 33: Sites 315 (Line Islands) and 317 (Manihiki Plateau)