Abstract
The marine Lower Pliocene at the Southwestern Sector of the Guadalquivir Valley is characterized by sorne rich ichnocoenoses clayey facies in the bottom series. A new ichnospecies is defined in this assemblages: Ophiomorpha Isabeli . An exterior pseudopelletal structure on the burrow lining produced by compactation or differential dissolution are the main distinguishing characteristics. Secondary peculiar features are the geometrical burrows systems: one is vertical or inclined, very long shafts, with Y-branches at the top, and another, is a cuasirectangular boxwork with horizontal tunnels and vertical shafts, both bifurcated at nearly right angles. A protective offshore environments is established where alternate, low dominant with not too heavy energetic conditions. This changes in the sedimentation rate is reflected in the morphology of the burrow systems. The tracemaker of Ophiomorpha isabeli is discused and a callianassid origin is assumed.
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