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Opal phytoliths are the silicified casts of epidermal cells of terrestrial grasses which have been described and illustrated from Atlantic Ocean sediment cores by Kolbe (1955) and Bukry (1979a, b), and from Mediterranean Sea cores by Dumitricà (1973) and Hajós (1973). The presence, in deep-sea sediments, of these microfossils of land plants has been attributed to wind transport on the basis of modern observations and analyses of dustfalls near Africa and across the Atlantic Ocean (Folger et al., 1967; Folger, 1970; and Kolbe, in part, 1957). The relative abundance and long duration of opal phytolith accumulation at the East Pacific Rise sites of Leg 54 seem to support eolian transport, rather than deposition by river and ocean currents. The opal phytoliths from Leg 54 are more diverse than those of the Atlantic and are most abundant in the lower Quaternary of the sites at the Siqueiros fracture zone. Opal phytoliths are sparse or absent at the two sites cored east of the Galapagos Islands (Figure 1).

Opal Phytoliths from the Tropical Eastern Pacific Ocean, Deep Sea Drilling Project Leg 54