Abstract

From Kimmeridgian to Valanginian, the northern part of the Iberian plate broke up into several graben systems, one of which is the Cameros basin in the northwestern part of the Iberian Range. The infill consists of fluvial-clastic and lacustrine or evaporitic carbonate rocks. During the Berriasian, a lacustrine complex developed. Detailed study of these deposits traces the limits of three typical zones: Zone (1), a periodically emergent lake (palustrine facies, extending over a large area), Zone (2), lakes in an alluvial plain, and Zone (3), a permanent lake (a) with a palustrine fringe (b). The corresponding zones are bounded by prominent, long-lasting and tectonically active structures.

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