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Basalt was recovered from the bottom few meters of the two holes beneath about 400 meters of sediment. At Site 245, the sedimentary sequence is 389 meters thick and ranges back in time to early Paleocene. Two varieties of basalt, a glassy and a diabasic type, were recovered from this hole. The coarse-grained (diabasic) variety is probably from an intrusive body that we anticipated could be considerably younger than the basement or glassy basalt. Site 248 penetrated 434 meters of sediment with an age range from probable late Paleocene to Pleistocene. The sample taken is representative of the 3.6-meter core of homogeneous porphyritic basalt considered to be basement at this site.

K-Ar Ages of Deep-Sea Basalts, Indian Ocean, Leg 25, Deep Sea Drilling Project