# List of fossiliferous stratigraphic units in Portugal

| Group or Formation | Period |
| Abadia Formation | Jurassic |
| Abadia Beds Formation | Jurassic |
| Alacer do Sal Formation | Neogene |
| Alcobaça Formation | Jurassic |
| Amaral Formation | Jurassic |
| Argilas de Aveiro Formation | Cretaceous |
| Assises à Orbitolines Formation | Cretaceous |
| Azóia Formation | Jurassic |
| Bombarral Formation | Jurassic |
| Brachyanticlinal of Caneças Formation | Cretaceous |
| Brejo Fundeiro Formation | Ordovician |
| Brenha Formation | Jurassic |
| Cabaços Formation | Jurassic |
| Cabeca Formation | Jurassic |
| Cabeco do Peao Formation | Ordovician |
| Cabril Formation | Ordovician |
| Cacela Formation | Neogene |
| Cacemes Group/Cacemes Formation | Ordovician |
| Calcaires et marnes à Choffatelles Formation | Cretaceous |
| Calcaires et silts de Ladeiras Formation | Cretaceous |
| Calcaires récifaux Formation | Cretaceous |
| calcaires récifaux inférieurs Formation | Cretaceous |
| Calcaires récifaux supérieurs Formation | Cretaceous |
| calcaires à Choffatelles et Dasycladacées Formation | Cretaceous |
| Calcaires à Polypiers de Lagosteiros Formation | Cretaceous |
| Calcaires à Rudistes de Boca do Chapim Formation | Cretaceous |
| Calcaires à Rudistes de Praia dos Coxos Formation | Cretaceous |
| Camadas de Almargem Formation | Cretaceous |
| Carregueira Formation | Ordovician |
| Esbarrondadoiro Formation | Neogene |
| Farta Pao Formation | Jurassic |
| Feligueira Grande Formation | Paleogene |
| Figueira da Foz Formation | Cretaceous |
| Fonte da Horta Formation | Ordovician |
| Freixial Formation | Jurassic |
| Gres de Bucaco Formation | Permian |
| Grès de Rochadouro Formation | Cretaceous |
| Grès de Silves Formation | Triassic |
| Grès et argiles supérieurs Formation | Cretaceous |
| Grès inférieur et assises à Orbitolines Formation | Cretaceous |
| Grès inférieurs Formation | Cretaceous |
| Grès à Dinosauriens Formation | Cretaceous |
| Grès à Trigonies Formation | Cretaceous |
| Grès, argiles et lignites inférieurs Formation | Cretaceous |
| Grès, argiles et lignites supérieurs Formation | Cretaceous |
| Lagos Portimao Formation | Neogene |
| Lagos Formation | Neogene |
| Les calcaires à choffatelles et dasycladacées Formation | Cretaceous |
| Littoral of Alentejo Formation | Neogene |
| Llandeilan Formation | Ordovician |
| Lourinhã Formation | Jurassic |
| Lower Bone Bed Formation | Neogene |
| Marnes et grès de Santa Susana Formation | Cretaceous |
| Marnes à Huîtres Formation | Cretaceous |
| Marnes à Toxaster Formation | Cretaceous |
| Marno Formation | Cretaceous |
| Montejunto Formation | Jurassic |
| Olhos Amarelos e Pousio da Galeota Formation | Cretaceous |
| Olhos de Agua sands Formation | Neogene |
| Ota Limestone Formation | Jurassic |
| Papo Seco Formation | Cretaceous |
| Peral Formation | Jurassic |
| Pteroceriano Formation | Jurassic |
| Rio Ceira Group/Ribeira do Bracal Formation | Ordovician |
| Sanguineira Group/Louredo Formation | Ordovician |
| Sanguinheira Group/Favacal Bed Formation | Ordovician |
| Sao Romao Formation | Jurassic |
| Serra de Aire Formation | Jurassic |
| Silveirinha Formation | Paleogene |
| Sobral Unit | Jurassic |
| São Gião Formation | Jurassic |
| Touril Complex Formation | Neogene |
| Valongo Formation | Ordovician |
| Venda Nova Group/Ferradosa Formation | Ordovician |
| Venda Nova Group/Porto de Santa Anna Formation | Ordovician |
| Xistensa Formation | Ordovician |
| Xistos com Nodulos Formation | Silurian |
| Água de Madeiros Formation | Jurassic |