The infaunal echinoid Micraster: Taphonomic pathways indicated by sclerozoan trace and body fossils from the Upper Cretaceous of northern Spain |
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Authors: | Samuel Zamora Eduardo Mayoral Sergio Bajo |
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Institution: | a Departamento de Ciencias de la Tierra, Área y Museo de Paleontología, Facultad de Ciencias, Universidad de Zaragoza, 50009 Zaragoza, Spain b Departamento de Geodinámica y Paleontología, Facultad de Ciencias Experimentales, Campus de El Carmen, Universidad de Huelva, Avda. de las Fuerzas Armadas, s/n. 21071 Huelva, Spain c Fundación Conjunto Paleontológico de Teruel-Dinópolis, Pol. Los Planos, s/n. 44002 Teruel, Spain |
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Abstract: | Micraster echinoid fossils are common in the Upper Cretaceous Olazagutía Formation of northern Spain. Tests frequently record sclerobiont signatures (including bioerosion and encrustation), left by reaction and/or coaction phenomena. Among bioerosion structures, Oichnus simplex, O. paraboloides, O. ichnosp. A, Trypanites solitarius, Rogerella ichnosp. indet., Centrichnus cf. eccentricus, Maeandropolydora ichnosp. indet. and fungal microborings are found, as well as pits and fractures. As for sclerozoan body fossils, bivalves (Dimyidae, Anomiidae, Plicatulidae and other Pectinacea), polychaete annelids (serpulids and spirorbids), lituolid foraminiferans (Haddoniidae and Coscinophragmatidae) and bryozoans (cheilostomate ones and others undetermined), as well as other less common groups, have been identified. Taphonomic paths followed by Micraster tests are analysed, based on conservation state and degree of colonisation and sedimentary filling. This allows to distinguish between accumulated fossils and non accumulated ones (including resedimented and reelaborated ones). |
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Keywords: | Micraster Epibiosis Bioerosion Taphonomy Upper Cretaceous Spain |
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