Careful preparation released an ammonite specimen from a block of highly indurated sandy limestone from the oyster bed of the Wanderfeld IV occurrence in Namibia. This find is important because Wanderfeld IV is one of two known marine onshore Cretaceous deposits on the west coast of Africa south of Angola. Although ammonites often permit precise dating of the beds in which they occur, the specimens from Wanderfeld IV are placenticeratids, most of which have low stratigraphic value because of the slow evolutionary changes that this family underwent and the provincialism that it shows. This is rather unusual among ammonites and thus, based solely on its ammonite record, the Wanderfeld IV site cannot be dated more precisely than probably Cenomanian to Coniacian. However, the accompanying bivalve fauna consists of rare Protocardia umkwelanensis and abundant Rhynchostreon suborbiculatum, which gives its name to the oyster shell bed. Based on the bivalves, the Wanderfeld IV occurrence is likely to be of Late Cenomanian age. Rare microfossils from the same blocks of rock as the macrofossils did not yield precise stratigraphic information. The Wanderfeld IV deposit is a bioclastic sandy limestone, representing a fully-marine, near-shore, high energy depositional environment as indicated by the presence of immature angular quartz grains in it. There are also a few well-rounded centimetric quartz pebbles in the limestone.