The Sierra Espuna is situated at the northern edge of the Internal Zone in the eastern Betic Cordilleras and is part of the unmetamorphosed Malaguide Complex. Palaeontological and sedimentological analysis of the Eocene to Aquitanian sediments on the northwest side of the Espuna yielded unexpected new information of importance for the reconstruction of the history of the Espuna itself and the Malaguides in general. The socalled Upper Eocene (Auversian) rocks are of Early Oligocene (P20) age and contain supermature detritus derived from outside the Malaguide realm. The hundreds of meters thick limestone conglomerate formation of the Espuna is of Middle Oligocene (P21) age and represents a backstepping fan delta complex at the margin of a carbonate platform situated to the northeast of the Espuna. Analysis of the clasts suggests that this platform was a part of the north Sardinian block given the majority of fragments of Upper Jurassic sheltered inner platform ( Clypeina-Trocholina limestones and dolomites). Contrary to former views (Paquet, 1966; Lonergan, 1993), the conglomerates cannot be considered to be the erosional products of Malaguide imbricated units. Therefore, one of the main arguments for early (Late Eocene to Oligocene) thrusting and nappe emplacement in the Espuna area is not valido Other arguments for early kinematics are discussed, among others the allegedly continuous sedimentation from the Late Eocene until the Langhian northwest of the Espuna. Our data indicate the existence of a stratigraphic gap, comprising the middle Aquitanian to middle Burdigalian. A new model for the development of the Espuna within the Malaguide realm during the Palaeogene to Early Miocene is presented. Main thrusting and nappe emplacement is thought to have been taken place during the late Aquitanian. Finally, the recently proposed 2000 clockwise rotation of the Espuna as a coherent block during the Early to Middle Miocene (AlIerton el al., 1993) is discussed. It is shown that this large figure is at variance with geological data and partly due to erroneous field observations.