Abstract
The Marines clays, muds and marls Formation consists of fine-grained sediments recording the transition from distal fluvial facies to shallow marine sediments, representing the onset of the first marine transgression of the Tethys sea in the Iberian Basin. Muds show irregular, parallel lamination of possible cryptalgal origin, wave ripples, linsen bedding, mud-cracks, vertical burrows and halite pseudomorphs and contain Anisian palynomorphs. The carbonate content increases towards the SE. The deposition of the Marines Formation took place in a rift (the Iberian Basin) during a period of distensive tectonics and, probably, during a marine transgression of eustatic origin, but the relative importance of the tectonic and eustatic factor is a matter of speculation in the area up to now.
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