Ammonite (Jurassic) - Coimbra Formation at Praia Velha

The lithological and facies succession of the Coimbra Fm in the S. Pedro de Moel area is unique within the Lusitanian Basin. The vertical facies variation allows for a detailed palaeoenvironmental assessment and sequence stratigraphic interpretation. In addition, and despite the rarity of age-diagnostic ammonites, this is the only basin area where the biostratigraphic record allows dating the Coimbra Fm, although a large part of the ammonite record is endemic
From: https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.144/#body-html-4