3.
Paleocene to upper Campanian clayey nannofossil ooze and chalk. The K/T boundary
was recovered at all three holes within this unit and seems well preserved
and complete. The biostratigraphically constrained boundary consists of a 0.3-cm
limonitic layer containing brown yellowish spherules (and presumably microkrystites
and the Ir anomaly) overlying a 9 to 17 cm, normally graded bed of green clay
spherules that is interpreted as microtektite ejecta (Fig. 11). The limonitic
layer is overlain by 4 cm of gray mottled clay, representing the earliest Cenozoic.
Below the K/T boundary, the 20-m-thick interval of Campanian to Maastrichtian
oozes shows signs of slumping below the K/T boundary.
