• The Ghajn Znuber Beds underlie the Coralline Algal Biostrome in western

•Malta and eastern Gozo. Distribution of the thinnest beds is patchy, but illustrates the very localized distribution of the major biocalcarenite sequences as north--south to east--west ridges up to 14 m thick. Each body consists of ginger-brown Heterostegina biomicrite or biomicrosparite showing a fiat basal profile, but often with a rather irregular upper surface. In addition, reworked sand lenses are found in the overlying biostrome above the sand-ridges. Internal sedimentary structures are rare, as the sediments are bioturbated. In the top metre of some ridges, reworking has occurred and small-scale tangential cross-stratification is visible together with erosion surfaces produced by east--west currents. Faunas are dominantly thick shelled and frequently reworked and bored. The sand waves of the Ghajn Znuber Beds were relatively static structures, subjected occasionally to highenergy conditions.

• subtidal sand-ridges