El aragoniense medio y superior en el suroeste de madrid: Los nuevos yacimientos de micromamíferos del mioceno medio de villaviciosa de odón y leganés

Abstract

This paper discloses two new sites in the southwestern area of Madrid, Villaviciosa de Odón and Leganés, which have provided two rich micromammals associations of different ages. The micromammal association of the Villaviciosa de Odón site determined in this work is composed by the following taxa: Lagomorpha: Lagopsis peñai; Erinaceomorpha: Galerix cf. exilis; Soricomorpha: Miosorex cf. grivensis; Rodentia: Atlantoxerus sp., Microdyromys sp., Armantomys tricristatus, Megacricetodon collongensis and Democricetodon sp. This association, mainly by the evolutionary stage of Megacricetodon collongensis, corresponds to the E local biozone after Daams & Freudenthal (1988a) from the end of the Middle Aragonian which is correlated with the end of the MN 5 Unit of Mein (1975). The micromammal association of the Leganés site consists of the following taxa: Lagomorpha: Lagopsis verus; Erinaceomorpha: Galerix cf. exilis; Rodentia: Heteroxerus cf. rubricati, Armantomys sp., Megacricetodon collongensis- crusafonti and cf. Democricetodon sp. Mainly by the evolutionary stage of Megacricetodon collongensiscrusafonti this association corresponds to the G1 local biozone after Daams et al. (1999 a y b) which is correlated with the MN 6 Unit of Mein (1975). It is the only site known in Madrid of this age. Both micromammals associations suggest an open environment dominated by hardvegetation of steppe kind, and a dry and relatively warm climate. © 2014 CSIC.