Geological Stages in the United Kingdom
The Geology of the United Kingdom is complex and most of the Cretaceous sediments are across The Midlands and Southern England. The Stages and representative sediments are given - for simplicity, much has been omitted. This chart only covers the pterosaur fossil sediments.
| Upper Cretaceous 100 - 65 Ma |
Maastrichtian | Trimmingham Chalk (Upper Chalk). |
| Senonian | Norwich Chalk (Upper Chalk). | |
| Turonian | Middle Chalk. | |
| Upper Cenomanian | Plenus Marls and Melbourne Rock, Lower Chalk. | |
| Middle Cenomanian | Lower Chalk. | |
| Lower Cenomanian | Chalk Marl, Warminster beds. | |
| Lower Cretaceous (Albian and
Aptian) 118 -100 Ma |
Upper Albian | Upper Gault and Upper Greensand, Red Chalk. |
| Middle Albian | Lower Gault, top of Lower Greensand, Speeton Clay. | |
| Lower Albian | Lower Greensand, top of Folkston Beds, Shenelly Limestone. | |
| Upper Aptian | Lower Greensand, Folkston Beds, Ferruginous Sands. | |
| Lower Aptian | Lower Greensand, Atherfield Clays. | |
| Lower Cretaceous (Neocomian) 135 - 118 Ma |
Barremian | Weald Clay, Upper Wealden Beds. |
| Hauterivian | Hastings Series, Middle Wealden Beds. | |
| Valangnian | Ashdown Sands, Lower Wealden Beds. | |
| Berrisian / Ryazanian | Durlston Beds / Upper Purbeck Beds | |
| Upper Jurassic -135 Ma |
Portlandian / Volgian | Lulworth Beds / Purbeck Beds, Portland Beds. |
| Upper Kimmeridgian | Hartwell Clay and Upper Kimmeridge Clays | |
| Lower Kimmeridgian | Kimmeridge Bay Shales and Lower Kimmeridge Clays. | |
| Oxfordian | Corallian Beds - Ampthill Clay and Upper Oxford Clay. | |
| Callovian | Oxford Clays, Kellaway Rock, Kellaway Clay and Upper Cornbrash. | |
| Middle Jurassic | Bathonian | Lower Cornbrash, Great Oolite and Inferior Oolite (Upper Deltic Series). |
| Bajocian | Inferior Oolite (Lower Deltic Series). | |
| Lower Jurassic 200 - Ma |
Upper Lias | Bridport Sands, Peak Shales, Allum Shales / Cotswold Sands, Jet Rock and Grey Shale. |
| Middle Lias | Marlstone Rock Beds, Sands and Clays. | |
| Lower Lias | Green Ammonite Beds, Belemnite Marls, Black Marl, Blue Lias. | |
| Triassic 240 - 200 Ma |
Rheatic | Langport Beds and Upper White Lias, Cotham Beds, Westbury beds and Contorta Shales. Bone Beds at base contain few pterosaur fragments. |
| Keuper | Marls and sandstones. | |
| Bunter | sandstones with few fossils. |