A Geological and Geomorphological Review of the Maltese Islands with Special Reference to the Coastal Zone Odette Magri Geography Division, Mediterranean Institute, University of Malta, Msida MSD06, Malta
[email protected] Territoris (2006), 6: 7-26 Territoris Universitat de les Illes Balears 2006. Núm. 6, pp. 7-26 ISSN: 1139-2169 A GEOLOGICAL AND GEOMORPHOLOGICAL REVIEW OF THE MALTESE ISLANDS WITH SPECIAL REFERENCE TO THE COASTAL ZONE Odette Magri ABSTRACT: Relationships between tectonics, geology and landforms are very evident in the Maltese Islands. Two rift systems belonging to different ages and having different trends dominate the structural setting of the Islands. The older rift generation creates a horst and graben structure north of the Great Fault. The second rift generation –the Maghlaq Fault– is associated with the Pantelleria Rift. The fault determines the south-west littoral of Malta and is responsible for the north-east tilt of the Islands. The geology is made up of Tertiary limestones with subsidiary marls and clays. The geological formations are very distinctive lithologically and this is reflected in characteristic topography and vegetation. The main focus of this paper is on the coastal zone where the relationship between geology and geomorphology is particularly evident. The coast although being only about 190 km long features a large variety of landforms. Lower Coralline Limestone forms vertical plunging cliffs reaching more than 200 m in some places. Globigerina Limestone features cliffs which in most cases are fronted by shore platforms. Blue Clay displays itself as slopes which extend from the base of the Upper Coralline Limestone plateau to sea-level.