Abstract: A section approximately 30 m thick in the uppermost part of the deltaic lower Pleistocene Tursi Sandstone at Rabatana has been analyzed. It contains Bichordites monastiriensis, rare Macaronichnus segregatis, and very rare Rosselia socialis (Bichordites ichnoassemblage) in the lower part, and abundant B. monastiriensis and R. socialis, and rare M. segregatis ( Bichordites-Rosselia ichnoassemblage), in the upper part. Ichnofabric and sedimentologic features indicate upper- to middle-shoreface conditions in the lower part of the section, decreasing in energy up section to lower-shoreface conditions. The Bichordites ichnoassemblage is related to unstable conditions on the sea floor, which favored infaunal colonization by vagile irregular echinoids. The Bichordites-Rosselia ichnoassemblage is related to more stable conditions in a probably deeper and / or protected environment, and to clearer waters in a declining deltaic system. Under such conditions, colonization by sedentary ?terebelloid tracemakers of R. socialis, which fed on the sea floor, was possible. The low trace-fossil diversity is related to intense bioturbation by echinoids, which prevented colonization by other tracemakers, except for the Rosselia tracemakers.