Early Cretaceous fish trails from La Rioja, Spain |
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| Authors: | Loïc Costeur Rubn Ezquerra |
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| Institution: | aNaturhistorisches Museum Basel, Augustinergasse 2, CH 4001 Basel, Switzerland;bInstituto de Estudios Riojanos, Portillo 2, 26001 Logroño, La Rioja, Spain;cFundación Patrimonio Paleontológico de La Rioja, 26586 Enciso, La Rioja, Spain |
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| Abstract: | We report a new find of the fish trail Undichna unisulca in fluvial sediments of the Lower Cretaceous Oliván Group of the Cameros Basin (Aptian-Albian; Valtrujal, La Rioja, northern Spain). It is the second Mesozoic record of Undichna unisulca after the first discovery in the Lower Cretaceous of central Spain (Las Hoyas, Cuenca, central Spain). The trails are characterized by single sinusoidal waves which in this case are often surrounded by well-preserved lateral levees that rule out an undertrail hypothesis.The continental depositional setting, a floodplain fluvial system, reflects the known broad palaeoenvironmental distribution of Undichna and confirms its occurrences in freshwater settings. |
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| Keywords: | Fish trails Lower Cretaceous Olivá n Group Cameros Basin La Rioja Spain |
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