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Silicification contemporaine à la sédimentation dans l'unité basale du paléogène du bassin du Duero (Espagne)

open access: closed, 1983
The Paleogene base unit of the Duero basin, dated as Paleocene, is a sedimentary series of fluvial origin. Of the four members of which the unit is composed, the two uppermost are formed by a series of cyclothem which show an intense silicification. The silicification is of edaphic origin arid is shown by opal cementation.
José-Antonio Blanco-Sanchez, M. Cantano
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