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Submarine volcanic rocks (pillow lavas) appear into the marly limestones and marls of the Capas Rojas Formation in the Median Subbetic. The dating with nannoplankton of the immediately underlying and overlying materials to these volcanic rocks has allow us to precise the age of this volcanic activity as Late Santonian (nannofossil biozone of <i>Rucinolithus hayi</i>. This volcanic event arose 84 million years ago, according to the absolute age obtained with the calibration of this biozone. It is the last Mesozoic volcanic activity registered until now in the External Zones of the Betic Cordilleras. The age of this event corresponds to the ending part of the interval of the Sudiberian continental margin evolution as an extensive margin, relatively nearly to the time in which it evolved to a convergent margin  Rocas volc&#225;nicas submarinas (lavas almohadilladas) aparecen intercaladas entre calizas margosas y margas de la Formaci&#243;n Capas Rojas del Subb&#233;tico Medio. La dataci&#243;n con nannoplancton de los materiales inmediatamente infrayacentes y suprayacentes a estas rocas volc&#225;nicas ha permitido precisar la edad de este vulcanismo como Santoniense superior (biozona de nannof&#243;siles de <i>Rucinolithus hayi</i>). Este evento volc&#225;nico ocurri&#243; hace unos 84 millones de a&#241;os de acuerdo con la calibraci&#243;n a tiempos absolutos de la biozona indicada. Se trata por tanto de la actividad volc&#225;nica mesozoica m&#225;s moderna datada hasta el momento en el conjunto de las Zonas Externas de las Cordilleras B&#233;ticas. La edad de este evento corresponde a la parte terminal del intervalo de tiempo durante el cual el margen continental sudib&#233;rico constituy&#243; un margen extensivo, relativamente cercano al momento en que ocurri&#243; su transformaci&#243;n a un margen convergente

estudios geológicos

Vulcanismo submarino del Santoniense en el Subbético: datación con nannofósiles e interpretación (formación Capas Rojas, Alamedilla, provincia de Granada)