On-line supplementary material: Field correlation at the Villarroya Basin
Orthophoto quad 1:5.000 scale of the Villarroya Basin displaying the location of the
VIL-1 and VIL-2 profiles as well as the location of the different fossil localities (white
stars). The conglomeratic beds used for the correlation are mark out (white line) and
magnetozones are also mapped (dark grey mask). Geographic information from the
Spatial Data Infrastructure service from La Rioja government (year 2006).
http://www.iderioja.larioja.org/
The correlation established in this study by paleomagnetic analysis is fully coherent
with topographic, stratigraphic and sedimentological data.
 This correlation agrees with the topographic elevation of the top of both
stratigraphic profiles (905 m in VIL-1 and 885 m in VIL-2), which are
280 m far from each other.
 The VIL-1 and VIL-2 profiles have been physically correlated (Pueyo et
al. 2004) based on aerial photographs (1:5000), detailed mapping and
fieldwork. In the meter 22 of the VIL-2 profile two conglomeratic levels
appear on a sandy set. This limit can be tracked, with very little
uncertainty, until the meter 47 of the VIL-1 profile.
 The facies are coherent with the sedimentological and paleogeographical
interpretations (Muñoz 1992).
The re-assignation of chrons established by Agustí and Oms (2001) strictly follows
biochronological arguments and obviates the quality of the magnetostratigraphic study
at Villlarroya (among the best sections of the entire Villafranchian). This correlation
shows very serious chronologic, topographic, stratigraphic and sedimentological
problems:
 Chron N3 in VIL-1 does not appear in VIL-2 and the chron N2 in VIL-1
undergoes a significant reduction in thickness in VIL-2.
 According the correlation the top of both sections are separated 40 m in vertical
while the real vertical distance is 20 m.
 The physical correlation of both sections shows significant vertical variation in a
horizontal framework, where, except in the base of the series (see figure above),
is no significant deformation or tilting of the series.
 The lacustrine facies in VIL-1 are related with alluvial fans in VIL-2.