| Order | Type | Group | Form-ati | Member | Description | Upper | Lower | Basin |
| By No. | on | Age | Age |
| 2551.0 | SED | SSG | SSG2 | Sherwood Sandstone Gp Zone II | T | WSXB |
| 2552.0 | SSG3 | Sherwood Sandstone Gp Zone III |
| 2553.0 | SSG4 | Sherwood Sandstone Gp Zone IV |
| 2554.0 | USST | Upper Sherwood Sandstone | TS | EMSH |
| 2555.0 | MSGM | Middle Sherwood Gypsiferous |
| 2556.0 | MSHM | Middle Sherwood Marl | T |
| 2557.0 | LSST | Lower Sherwood Sandstone | TS |
| 2558.0 | SHMS | Sherwood Massive Sand | TL | SCE |
| 2559.0 | KNSF | Kinnerton Sandstone Formation | TS | SPEN IRSE |
| 2560.0 | ORMQ | Ormskirk Sandstone Fm Equivalent | T | IRSEB |
| 2561.0 | ORMF | Ormskirk Sandstone Formation | TL | WLAN CHES |
| 2562.0 | OS2B | Ormskirk Sandstone OS2b | T | IRSE |
| 2563.0 | OS2A | Ormskirk Sandstone OS2a |
| 2564.0 | OSK1 | Ormskirk Sandstone OS1 |
| 2565.0 | TAWS | Tarporley Waterstones Member | TA | CHE |
| 2566.0 | UOSF | Upper Ormskirk Sandstone Format. | TS | TA | SPEN IRSE |
| 2567.0 | LOSF | Lower Ormskirk Sandstone Format. |
| 2568.0 | LFLV | Lower Fluvial Member | T | IRSE |
| 2569.0 | WFU | Wytch Farm Unit | WSXB |
| 2570.0 | WFUU | Wytch Farm Upper Unit |
| 2571.0 | WFMU | Wytch Farm Middle Unit |
| 2572.0 | WFLU | Wytch Farm Lower Unit |
| 2573.0 | HBSF | Helsby Sandstone Formation | TS | CHE |
| 2574.0 | KWST | Keuper Waterstones | TL | SOLW IRSEB MANX |
| 2575.0 | KSST | Keuper Sandstone |
| 2576.0 | FROD | Frodsham |
| 2577.0 | DELA | Delamere |
| 2578.0 | THUR | Thurstaston |
| 2579.0 | LKSS | Lower Keuper Sandstone | WSXB |
| 2580.0 | KPSE | Keuper Sandstone Equivalent | T |
| 2581.0 | WSSF | Wilmslow Sandstone Formation | TS | WOR |
| 2582.0 | WLMF | Wilmslow Fluvial Member | T | IRSE |
| 2583.0 | UWSM | Wilmslow Upper Member | TS | WOR |
| 2584.0 | WSMM | Wilmslow Main Member |
| 2585.0 | ULFV | Upper Fluvial Member | T | IRSE |
| 2586.0 | MSTM | Main Sandstone Member |
| 2587.0 | STBQ | St Bees Sandstone Fm Equivalent | IRSE |
| 2588.0 | STBS | St Bees Sandstone | PU | TL | SOLW IRSEB MANX |
| 2589.0 | USBS | Upper St Bees Sandstone | TS | IRSE |
| 2590.0 | LSBS | Lower St Bees Sandstone |
| 2591.0 | FLUV | Fluvial Unit | TL |
| 2592.0 | SILZ | Silicified Zone | TS | SPEN IRSE |
| 2593.0 | WWFE | Wilmslow Formation Equivalent |
| 2594.0 | CPBE | Chester Pebble Beds Equivalent |
| 2595.0 | USSB | St.Bees Upper Sand Unit | T | IRSE |
| 2596.0 | LSSB | Lower Sandstone Unit |
| 2597.0 | CPBF | Chester Pebble Beds |
| 2598.0 | BSD | Bridgeworth Sandstone Formation | P | WOR |
| 2599.0 | UPST | Upper Sandstone | TL | WCHB |
| 2600.0 | UPSC | Upper Sherwood Claystone | TM | WSXB |
| 2601.0 | PEBB | Pebble Beds | WCHB |
| 2602.0 | PEBE | Pebble Beds Equivalent | T | WSXB |
| 2603.0 | NERG | New Red Sandstone | INMF CNSB |
| 2603.5 | SHET | HRSH | Heron Shale | TU | CNSB |
| 2603.6 | USKG | Upper Skagerrak Formation |
| 2603.7 | LSKG | Lower Skagerrak Formation |
| 2604.0 | NERG | STOR | Stornoway Formation | P | T | ROCK |
| 2605.0 | TRBS | Triassic Red Beds | T | INMF ESHB |
| 2606.0 | PTBG | Permo-Triassic Red Beds Group | P | T | SONS |
| 2607.0 | UMPT | Undifferentiated Mudstone Form. | SWAP |
| 2608.0 | USPT | Undifferentiated Sandstone Form. |
| 2609.0 | UIPT | Undiff.Interbedded Sandstone Fm. |
| 2610.0 | UCPT | Undifferentiated Conglomerate Fm |
| Page 42 of 60 | 07/07/2004 |