Materiales redepositados del Jurásico Superior-Cretácico Inferior: Cronoestratigrafía y Génesis (Unidad del Ventisquero, zona Subbética, Jaén)

• Autores: Ginés Alfonso de Gea Guillén, Luis Miguel Nieto Albert, Roque Aguado Merlo, José Miguel Molina Cámara, Pedro Alejandro Ruiz Ortiz
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 1, 2, 2000 (Ejemplar dedicado a: V Congreso Geológico de España (Alicante, 10-14 julio 2000)), págs. 183-186
• Idioma: español
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• Resumen

  • A detailed biostratigraphic study of late Jurassic and early Cretaceous rocks from the Ventisqueros - del Trigo Unit (Subbetic Zone, South of Jaén), mainly based on calcareous nannofossilsand calpionellids, has been performed. The chronostratigraphic analysis of the different formations near the Jurassic-Cretaceous boundary indicates an important complexity in their relationships. Very close to this boundary it has been detected a stratigraphic break whose associated hiatuscovers, depending on locations, a variable time interval (about 4.2 to 12.4 m.y.). Also associated to the rocks of this unit, and near the Jurassic-Cretaceous boundary, reworked materials (polygenicbreccias, pebbly mudstones and slumps) are common. The polygenic breccias are located infive chronostratigraphic levels: earliest Tithonian, late Tithonian, early Valanginian, earlyHauterivian and late Hauterivian.