A Calcareous Nannofossil and Organic Geochemical Study of Marine Palaeoenvironmental Changes Across the Sinemurian/Pliensbachian (Early Jurassic, Similar to 191 Ma) in Portugal
                        AuthID
P-00K-89A
                
    P-00K-89A
 
    
                     
    
                     
    
                     
                    