| Order | Type | Group | Form-ati | Member | Description | Upper | Lower | Basin |
| By No. | on | Age | Age |
| 2299.0 | SED | TRIG | TIUF | Triassic Unit 4 | TD | TC | WESH |
| 2300.0 | TIUT | Triassic Unit 3 |
| 2301.0 | TIUH | Triassic Unit 2 |
| 2302.0 | TIUD | Triassic Unit 1 |
| 2303.0 | TRCH | Triassic Chert | T | INMF |
| 2304.0 | RHAG | Rhaetic Group | TR | SONS |
| 2305.0 | RHAE | Rhaetic Undifferentiated | TU |
| 2306.0 | RHAU | Upper Rhaetic | TR | EMSH |
| 2307.0 | RHAL | Lower Rhaetic |
| 2308.0 | KMSS | Keuper Mudstones Silt and Ssts | TM | TU | STCR COCB COHI |
| 2309.0 | SALT | Salt | TC |
| 2310.0 | GMM | Grey Marl | TN | WCHB |
| 2311.0 | TGM | Tea Green Marl | TC | TN |
| 2312.0 | RMRL | Red Marl | TM | TC |
| 2313.0 | TOWB | Triassic (Offshore Wst.Brit.) Gp | T | SWAP CARD |
| 2314.0 | UTRS | Upper Triassic Sandstone | TU | WSXB |
| 2315.0 | TRBT | Transitional Beds | SWAP |
| 2316.0 | MIKE | Middle Keuper | TC | TN |
| 2317.0 | UCMK | Upper Clastic |
| 2318.0 | USMK | Upper Salt |
| 2319.0 | MCMK | Middle Clastic |
| 2320.0 | LSKE | Lower Salt | TD | TC |
| 2321.0 | LOKE | Lower Keuper |
| 2322.0 | LCLK | Lower Clastic |
| 2323.0 | TSLK | Transition Zone |
| 2324.0 | TSAL | Triassic Salt | TU |
| 2325.0 | BPBE | Bunter Pebble Bed Equivalent | T |
| 2326.0 | MMG | Mercia Mudstone Group | TM | TN | IRSE ANPA CARD |
| 2327.0 | DHLT | Dorset Halite | TU | CECH |
| 2328.0 | MRCS | Mercia Sandstone | T |
| 2329.0 | ELSW | Elswick Mudstone Formation | IRSE |
| 2330.0 | WART | Warton Halite Formation |
| 2331.0 | DBMF | Dowbridge Mudstone Formation | TM | TN |
| 2332.0 | LEYL | Leyland Formation |
| 2333.0 | BLPL | Blackpool Mudstone Member | T |
| 2334.0 | FYDE | Flyde Halite Member |
| 2335.0 | STAN | St Anah Member |
| 2336.0 | CLEV | Cleveleys Mudstone Member | TM |
| 2337.0 | ANDL | Andsell Mudstone Member |
| 2338.0 | SINF | Singleton Mudstone Formation | T |
| 2339.0 | MMGA | Mercia Mudstone Unit A | WSXB |
| 2340.0 | MMGB | Mercia Mudstone Unit B |
| 2341.0 | MMGC | Mercia Mudstone Unit C |
| 2342.0 | MMGD | Mercia Mudstone Unit D |
| 2343.0 | MMGE | Mercia Mudstone Unit E |
| 2344.0 | MMGF | Mercia Mudstone Group Unit F |
| 2345.0 | MMGG | Mercia Mudstone Unit G |
| 2346.0 | UCMG | Upper Claystone Formation | TU | SWAP |
| 2347.0 | SFMG | Saliferous Formation | TD | TC |
| 2348.0 | LCMG | Lower Claystone Formation |
| 2349.0 | MSMM | Massive Salt | TC | TN | CARD |
| 2350.0 | TNT | Trent Formation | TN | SPE |
| 2351.0 | GPV | Glen Parva Formation | TR | WID |
| 2352.0 | EDWA | Edwalton Formation | TC | EMSH |
| 2353.0 | HARL | Harlequins Formation |
| 2354.0 | CARL | Carlton Formation | TD |
| 2355.0 | RADF | Radcliffe Formation |
| 2356.0 | COL | Colwick Formation |
| 2357.0 | RET | Retford Formation |
| 2358.0 | WOOD | Woodthorpe Formation | TA |
| 2359.0 | COT | Cotgrave Skerry | TC |
| 2360.0 | HOLS | Hollygate Skerry | T |
| 2361.0 | GREB | Green Beds |
| Page 38 of 60 | 07/07/2004 |