Site NBP0602A-9, drilled during the SHALDRIL II cruise of the RV/IB Nathaniel B. Palmer, includes two holes located in the Northern James Ross Basin in the western Weddell Sea, very close to the eastern margin of the Antarctic Peninsula. Sediment from these holes consists of Pleistocene glaciomarine muds interspersed with numerous volcanic pebbles and sedimentary clasts. Analysis of eight sedimentary clasts yielded diverse Maastrichtian and Paleocene calcareous nannofossil assemblages. These assemblages represent three distinct ages: early Maastrichtian, late Maastrichtian, and early Paleocene. The Maastrichtian assemblages are similar to those found in the López de Bertodano Formation on neighboring Seymour and Snow Hill Islands, making it the likely source area for the clast material. Although no calcareous nannofossils have been reported from Paleocene formations in the area, the occurrence of calcareous foraminifers suggests other calcareous plankton may be present; thus the Paleocene clasts likely also originated from the Seymour Island area.