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The upper Eocene-upper Oligocene sequence drilled in Hole 460, Leg 60, is a pebble conglomerate with crystal calcareous mud. A thin section of one of the pebbles (Plate 1) was made on shipboard. This rock fragment was itself a conglomerate with small pebbles in a volcaniclastic matrix. Some of the pebbles are siliceous and radiolarian-rich and others are calcareous and contain microfossils with the general aspect of the genus Calpionella. Unfortunately the thin section was lost and only photographs remain. Some of these fossils are small (less than 100 μm), consisting of a small chamber with axial symmetry and lacking ornamentation. The chamber narrows to a short, straight cylindrical neck which is open at the distal end. These last characteristics indicate Calpionella alpina Lorenz, which ranges from late Tithonian to Berriasian. Calpionellids are planktonic microfossils (Remane, 1971). Their biological affinity has not yet been definitively established, but they are thought to be protozoans. Nevertheless, they are excellent time indicators (Allemann et al., 1971). They are restricted to the period between the Late Jurassic to early Valanginian. They

The Late JurassicEarly Cretaceous Genus Calpionella in Reworked Pebbles from Deep Sea Drilling Project Site 460, Mariana Transect

The Late JurassicEarly Cretaceous Genus Calpionella in Reworked Pebbles from Deep Sea Drilling Project Site 460, Mariana Transect