Person:
Domingo Martínez, María Soledad

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First Name
María Soledad
Last Name
Domingo Martínez
URI
https://hdl.handle.net/20.500.14352/76828
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Educación-Centro Formación Profesor
Department
Didáctica de Ciencias Experimentales, Sociales y Matemáticas
Area
Didáctica de las Ciencias Experimentales
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    Paleoenvironmental conditions in the Spanish Miocene-Pliocene boundary: Isotopic analyses of Hipparion dental enamel
    (Naturwissenschaften, 2009) Domingo Martínez, Laura; Grimes, Stephen T.; Domingo Martínez, María Soledad; Alberdi, M. Teresa
    Expansion of C4 grasses during Late Miocene and Early Pliocene constitutes one of the most remarkable biotic events of the Cenozoic era. The Teruel-Alfambra region (northeastern Spain) contains one of the most complete Miocene-Pliocene sequences of mammalian fossil sites in the world. In this study, stable isotope (δ 13C and δ 18O) analyses have been performed on the tooth enamel from the equid Hipparion from 19 localities spanning a time interval from approximately 10.9 to 2.7 Ma. This time range starts with the first appearance of this genus in Spain and ends at its extinction. An increase in δ 13C at about 4.2 Ma has been observed, indicative of a shift toward a more open habitat. This shift may be related to a large scale vegetation change which occurred across the Miocene-Pliocene boundary when C4 grasses expanded. This expansion might in turn be linked to global tectonic events such as the uplift of the Himalaya and/or the closure of the Panama Isthmus. However, other more regional factors may have ultimately enhanced the trend toward more open habitats in the Western Mediterranean Basin. The Messinian Salinity Crisis was a major environmental event that may have been responsible for the isotopic changes seen in the equid Hipparion from the Iberian Peninsula along with an increase in the aridity detected ~4.6 Ma ago in the Sahara. Even though the exact factor triggering the isotopic change observed in the Hipparion enamel remains mostly unknown, this study demonstrates that the global environmental changes detected across the Miocene-Pliocene boundary are also recorded in the realm of the Iberian Peninsula.
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    A new quantitative biochronological ordination for the Upper Neogene mammalian localities of Spain
    (Palaeogeography, palaeoclimatology, palaeoecology, 2007) Domingo Martínez, María Soledad; Alberdi, María Teresa; Azanza, Beatriz
    The MN scale is the most widely used biochronological scale for the mammalian fossil record of Europe but at the same time it has brought a high amount of criticism with it. The fossil record of Neogene macromammals from Spain is one of the most complete of the world and provides an interesting test of the MN biochronology. We used maximum likelihood appearance event ordination (ML AEO), a quantitative biochronological method, to provide not only an ordination but also a numerical age estimate for each of the 90 macromammalian fossil faunas that constitute our data base. Originally, only 13 of these localities were numerically dated (mainly by means of paleomagnetism). The ordination of macromammalian fossil faunas matches quite well with the MN chronology at least in the Miocene. The pattern of ordination is less coherent in the Pliocene partly due to the relative poverty of macromammalian fossil sites of this age in Spain. The controversy on whether the age of the first appearance of hipparionine horses in the Iberian Peninsula (Hipparion dispersal event) was around 10.8–10.7 Ma or 11.1 Ma is discussed. Our estimated MN7/8–MN9 boundary lies between 11.008 and 10.873 Ma. We conclude that the arrival of hipparionine horses in the Iberian Peninsula happened between these two ages and that the oldest record is found in the locality of Nombrevilla 1 with an age of 10.873 Ma.