Organización del relleno sedimentario en los yacimientos de mamíferos del Cerro de los Batallones, Cuenca de Madrid

  1. José Pedro Calvo Sorando 1
  2. Manuel Pozo Rodríguez 2
  3. Pablo G. Silva Barroso 3
  4. Jorge Morales Romero 4
  5. Pedro Carrasco García 5
  1. 1 Universidad Complutense de Madrid

    Universidad Complutense de Madrid

    Madrid, España

    ROR 02p0gd045

  2. 2 Universidad Autónoma de Madrid

    Universidad Autónoma de Madrid

    Madrid, España


  3. 3 Universidad de Salamanca

    Universidad de Salamanca

    Salamanca, España


  4. 4 Museo Nacional de Ciencias Naturales

    Museo Nacional de Ciencias Naturales

    Madrid, España


  5. 5 Técnicas Geofísicas, S.L.,
Geotemas (Madrid)

ISSN: 1576-5172

Year of publication: 2012

Issue: 13

Pages: 68-71

Type: Article

More publications in: Geotemas (Madrid)


Nine fossil mammal sites of late Miocene age (~ 9 Ma) have been found so far in Cerro de los Batallones. The mammal sites occur as up to 15 m deep, irregular cavities hosted in clays (mostly sepiolite), chert and carbonate bedrock. Initial development of cavities resulted from solution of underlying evaporite formations. Piping and subsequent chambering accounted for further enlargement and stability of the cave system. The sedimentary infill of the cavities consists mainly of poorly-sorted clastic deposits and calcareous marlstone. Six main lithofacies are recognized. The detrital components derived directly from the host bedrock. Calcareous marlstone occurs either as basal underground pond deposits or top layers sealing the cavities, usually off-lapping the adjacent bedrock. δ18O and δ13C compositions of the carbonate range from -3.71 to -7.48‰ and from -6.84 to -12.05‰, respectively. Marlstone deposits in the lowermost part of the cavities display patent similarity to isotopic signatures from bedrock. Deposition of calcareous marlstone took place in short-lived lakes (i.e. ponds) fed by rain and groundwater that developed in a pseudo-karst landscape acting as natural traps for the large variety of fossil mammals recorded in Cerro de los Batallones.