Publication: Nuevas aportaciones sobre la influencia marina y la edad de los
carbonatos de la Fm Leza en el sector de Préjano (SE de La
Rioja). Cretácico Inferior, Cuenca de Cameros
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Publication Date
2010
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Sociedad Geológica de España
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Abstract
The Cameros Basin is a rift basin whose sedimentary infill is essentially continental with some episodes
of marine influence. The Leza Fm carbonates (Enciso Gr, Barremian-Aptian) correspond to one of these
episodes and their depositional environment has been described as lacustrine with occasional marine
incursions. A detailed facies analysis of these carbonates in the Préjano area has led to the conclusion that
the depositional environment of the Leza Fm in this area is in fact a system of coastal-lakes filled with
brackish water as shown by the abundance of marine microfossils (Dasycladales algae and foraminifera)
coexisting with continental microfossils (charophytes). The age of the Dasycladales found in the studied
area is Barremian-Albian and thus it confirms the Barremian-Aptian age proposed for the Leza Fm and the
Enciso Gr.