The Tertiary deposits of the Sado Basin (in southwestern Portugal) were deposited in a typical continental basin, composed by 4 main lithostratigraphic units. During the Palaeogene, the Sado Basin was a closed basin in which the mineralogy of the primary facies underwent significant changes that resulted in the extensive occurrence of palygorskite. The Palaeogene fill of the Sado basin is composed by reddish co...
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