The Coimbra Group (Also known as Camadas de Coimbra or Calcários de S. Miguel) is a geological group of Sinemurian-Pliensbachian (Lower Jurassic) age in the Lusitanian Basin of Portugal. The unit is made of the Coimbra & the Água de Madeiros Fms, that represent a series of peritidal to intertidal facies of a Carbonate platform mostly of Obtusum-Ibex age, that gradually evolve to open marine/hemipelagic units Vale das Fontes Formation and Lemede formation.
The Coimbra Group (Also known as Camadas de Coimbra or Calcários de S. Miguel) is a geological group of Sinemurian-Pliensbachian (Lower Jurassic) age in the Lusitanian Basin of Portugal. The unit is made of the Coimbra & the Água de Madeiros Fms, that represent a series of peritidal to intertidal facies of a Carbonate platform mostly of Obtusum-Ibex age, that gradually evolve to open marine/hemipelagic units Vale das Fontes Formation and Lemede formation.
Source: Wikipedia "Coimbra Group (geology)" · CC BY-SA 4.0
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