Ichnology of the Pliocene of Conil de la Frontera

Proximal-distal ichnofabric changes in a siliciclastic shelf, Early Pliocene, Guadalquivir Basin, SW Spain Jordi M. de Gibert, Universitat de Barcelona Julio Aguirre, Universidad de Granada

Guadalquivir Basin Puntalejo Fuente del Gallo Cala del Aceite Cabo Roche (Faro)

CALA DEL ACEITE UNIT 1 UNIT 2 UNIT 3

UNIT 1 Messinian marls FUENTE DEL GALLO

UNIT 1 UNIT 2 CALA DEL ACEITE

Fuente del Gallo Cala del Aceite Puntalejo Cala del Aceite Cabo Roche (lighthouse) Fuente del Gallo Cabo Roche (lighthouse) Puntalejo

Puntalejo Fuente del Gallo Cala del Aceite Cabo Roche (lighthouse) ? Gray mudstones Silts and sandy siltstones Fine to medium-grained sands with planar cross-bedding Fine to medium-grained sands with through cross-bedding Fuente del Gallo Sur Fuente del Gallo Norte NW-SE Puntalejo

Puntalejo Fuente del Gallo Cala del Aceite Cabo Roche (lighthouse) Gray mudstones Silts and sandy siltstones Fine to medium-grained sands with planar cross-bedding Fine to medium-grained sands with through cross-bedding ? Puntalejo Cala del Aceite Cabo Roche (lighthouse) NW-SE ? ?

CROSS-BEDDED SANDS AND SANDSTONES

SANDY SILTSTONES

TABULAR SANDSTONES

Tide-dominated & storm-influenced shelf model Anderton 1976

MACARONICHNUS - BICHORDITES ICHNOFABRIC

MACARONICHNUS - BICHORDITES ICHNOFABRIC Facies: Cross-bedded sandstones (occasionally tabular sandstones) Ichnofabric index: 3-4 Ichnotaxonomic composition: Macaronichnus segregatis, Bichordites monastieriensis Ichnoguilds: Shallow-tier vagile sediment/detritus-feeders Colonization mode: Short colonization window due to rapid foreset progradation of sand dunes Similar ichnofabrics: Bichordites ichnofabric Bateig Stone, Miocene, SE Spain Gibert & Goldring 2007 Ophiomorpha-Macaronichnus ichnofabric Lower Greensand, Cretaceous, England Pollard et al. 1993

CYLINDRICHNUS ICHNOFABRIC

Facies: Sandy siltstones Ichnofabric index: 3-4 Ichnotaxonomic composition: Cylindrichnus concentricus, Teichnichnus rectus, Planolites montanus, Rosselia socialis, Ophiomorpha nodosa , undefined mottling Ichnoguilds: deep-tier suspension-feeders, shallow- and middle-tier deposit-feeders Colonization mode: No clear colonization surfaces. Probably continuous colonization. Similar ichnofabrics: Cylindrichnus ichnofabric Ardenya Unit, Miocene, NE Spain CYLINDRICHNUS ICHNOFABRIC

ROSSELIA ICHNOFABRIC ( ROSSELIA PIPEROCK)

Facies: Cross-bedded sandstones, tabular sandstones, and sandy siltstones Ichnofabric index: 3 Ichnotaxonomic composition: Rosselia socialis Ichnoguilds: Deep-tier suspension-feeders Colonization mode: Probable event colonization with posterior readjustement to keep pace with sedimentation Similar ichnofabrics: Rosselia ichnofabric Kongochi Formation, Pleistocene, Japan Nara 2002 ROSSELIA ICHNOFABRIC ( ROSSELIA PIPEROCK) Rosselia ichnofabric Chui Formation, Pleistocene, Brazil Gibert et al. 2006

THALASSINOIDES ICHNOFABRIC

Facies: In a single horizon bounding clearly different lithofacies Ichnofabric index: 3-4 Ichnotaxonomic composition: Thalassinoides cf. suevicus, Thalassinoides paradoxicus, Phycodes isp. Ichnoguilds: middle-tier deposit-feeders Colonization mode: Single colonization of an omission (firmground?) surface Similar ichnofabrics: Glossifungites ichnofacies Chenque Formation, Miocene, Argentina Carmona et al. 2006 Thalassinoides-Spongeliomorpha horizon Vallès-Penedès Basin, Miocene, NE Spain Gibert & Robles 2005 THALASSINOIDES ICHNOFABRIC

Macaronichnus-Bichordites Ichnofabric Cylindrichnus Ichnofabric Rosselia Ichnofabric suspension feeders cf. Cruziana Ichnofacies cf. Skolithos Ichnofacies cf. Skolithos (+ Cruziana) Ichnofacies tides storms detritus/deposit feeders

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Ichnology of the Pliocene of Conil de la Frontera

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