Poster Number 43
The Hoces del Río Riaza Natural Park is located in Spain, at the southern border of the Tertiary Duero Basin. The Riaza River, tributary of the Duero River, crosses lengthwise the Park with deep gorges on its margins. The geology of the park comprises continental (terrigenous) and marine (carbonate) Cretaceous sediments, uncomformably overlaud by continental Neogene-Quaternary deposits. The Alpine Orogeny folded the Cretaceous, and controlled the sedimentation of the Neogene-Quaternary sediments, which are composed of several, stacked alluvial fans grading laterally into fluvio-lacustrine sediments. The compressional stresses of this orogeny also originated faults and joints. This park also shows a good representation of Mesozoic and Cenozoic fauna, such as pelecypods, rudists, gastropods, cephalopods, stromatolites, ostracods and forminifers.
Thus, the Hoces del Río Riaza Natural Park can be considered an excellent example of geological heritage, being a possible new member of the EGN, Global Geoparks Network, UNESCO.