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The palaeontological heritage evaluation of the Somosaguas fossil geosite has been revised on the basis of scientifi c and sociocultural criteria. By means of this study have been proposed four new criteria that arise from new scientifi c and social trends as well as technological advances. A temporal comparison has been established with previous evaluations obtained in the years 2000 and 2012. The results indicated an increase in the initial score of the geosite in each revision. Our study shows the relevance of palaeontological heritage evaluations as useful tools to improve fossil geosites management.

[EN] One of the most important contributions of Nieves López Martínez in Palaeobiogeography is the study of the ‘centre of origin of species’ concept and the proposal of the ‘Asymmetric Time Model’ as an alternative to the ‘Symmetric Time Model’, a key concept in dispersalist Historical Biogeography. As a consequence of these ideas, she discussed the methodology to establish biostratigraphic scales, pointing out that the higher number of ‘First Appearance Datum’ (FADs) over that of ‘Last Appearance Datum’ (LADs) in the fossil record supports the Asymmetrical Time Model. In this study we analyse the middle Miocene micromammal appearance and extinction events (FADs and LADs) based on well-calibrated local biostratigraphic scales from different European basins, in order to determine which of the proposed biogeographical models better fits the Miocene European micromammal record. [ES] Entre las aportaciones de Nieves López Martínez a la Paleobiogeografía, se puede destacar el estudio del concepto de ‘centro de origen de un taxón’ y la propuesta del ‘Modelo Temporal Asimétrico’ como alternativa al ‘Modelo Temporal Simétrico’, concepto básico de la Biogeografía Histórica dispersalista. A partir de estas ideas analizó la metodología de construcción de las escalas bioestratigráfi cas, señalando que el mayor número de eventos de primera aparición (FAD) en el registro fósil frente a los de última aparición (LAD) confirmaría el Modelo Temporal Asimétrico. En este trabajo se analizan los eventos de aparición y extinción (FADs y LADs) reconocidos en escalas bioestratigráficas locales bien calibradas de diferentes cuencas europeas, con el fin de comprobar cuál de los modelos biogeográficos se ajusta mejor al registro europeo de micromamíferos miocenos.