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Journal of Paleontology

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PARADICTYODORA ANTARCTICA: A NEW COMPLEX VERTICAL SPREITE TRACE FOSSIL FROM THE UPPER CRETACEOUS-PALEOGENE OF ANTARCTICA AND TIERRA DEL FUEGO, ARGENTINA

¹ Centro Austral de Investigaciones Científicas (CADIC-CONICET), CC 92, 9410 Ushuaia, Tierra del Fuego, Argentina, <emolivero{at}ciudad.com.ar>
² Instituto Superior de Correlación Geológica, CC 1; 4000 San Miguel de Tucumán, Argentina, <ichnolog{at}infovia.com.ar>
³ Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellón 2; 1428 Buenos Aires, Argentina, <rscasso{at}gl.fcen.uba.ar>

A new ichnotaxon, Paradictyodora antarctica, is proposed for complex spreite trace fossils from the Upper Cretaceous of Antarctica and Eocene of Tierra del Fuego, Argentina. This complex, three-dimensional, vertical spreite structure enlarges upwards, displaying a prismatic-to-conical shape that consists of subvertical folded laminae, produced by the lateral migration of a subvertical J-shaped tube anchored at its base. Overall morphology and mode of formation distinguishes this new ichnotaxa from other ichnogenera such as Daedalus, Dictyodora, and Heimdallia. Paradictyodora occurs in fodinichnia-dominated ichnocoenosis developed in distal fine-grained deposits of deepwater fan delta systems.