The calcareousmicrofossil assemblage from Middle Miocene strata of SHALDRIL Site NBP0602A−5D consists of benthic foraminifera, ostracods, bivalves, and gastropods, and is interpreted as shallow−water. It appears to be reworked but its age is probably similar to the age of the host sediment, which contains only rare, fragmented, agglutinated foraminifera. Most of the calcareous taxa are of uncertain taxonomic affiliation, due to the scarcity of Ceno− zoic microfossils of this age fromWest Antarctica, and also the very different paleohabitat of this now extinct assemblage.