The rhythmic reef-type sedimentation of the Givetian synclinorium of Dianant (Belgium) has been the subject of a detailed facies study including faunal and physical chemical characteristics.

The more recent reefal phenomena dating from the upper Aptian in the vicinity of Reocin (west of Santander, Spain) have been compared lithologically and paleontologically.

The stratified mineralization is related closely to the Reocin reef facies. This is not an isolated case; other examples throughout the world illustrate such associations.

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