OR/16/020 Appendix 2
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| Loveless, S, and Smith, N. 2016. Summary of potential oil and gas formations in England for use in groundwater vulnerability assessments. British Geological Survey Internal Report, OR/16/020. |
GVS for England with oil and gas formations indicated, frozen February 2016.
| LEX‐RCS | DESCRIPTION | Oil and gas | Coal bed methane | Shale gas | |||
| SUPD‐UNKN | SUPERFICIAL DEPOSITS – UNKNOWN | ||||||
| CRAG‐PESA | CRAG GROUP – PEBBLY SANDS | ||||||
| SOLT‐CLSISA | SOLENT GROUP – CLAY, SILT AND SAND | ||||||
| BRBA‐SSCL | BRACKLESHAM GROUP AND BARTON GROUP (UNDIFFERENTIATED) – SAND, SILT AND CLAY | ||||||
| EOMIO‐CLSSG | EOCENE TO MIOCENE ROCKS (UNDIFFERENTIATED) – CLAY, SILT, SAND AND GRAVE | ||||||
| THAM‐CLSSG | THAMES GROUP – CLAY, SILT, SAND AND GRAVEL | ||||||
| LMBE‐CLSSG | LAMBETH GROUP – CLAY, SILT, SAND AND GRAVEL | ||||||
| TAB‐SSCL | THANET FORMATION – SAND, SILT AND CLAY | ||||||
| PGU‐CLSSG | PALAEOGENE SEDIMENTARY ROCKS (UNDIFFERENTIATED) – CLAY, SILT, SAND AND GRAVE | ||||||
| UIG‐FELSR2 | UNNAMED IGNEOUS INTRUSION, PALAEOGENE – FELSIC‐ROCK | ||||||
| UIG‐MFIR | UNNAMED IGNEOUS INTRUSION, PALAEOGENE – MAFIC IGNEOUS‐ROCK | ||||||
| UEXG‐LATM | UNNAMED EXTRUSIVE ROCKS, PALAEOGENE – MAFIC LAVA AND MAFIC TUFF | ||||||
| PCK‐CHLK | PORTSDOWN CHALK FORMATION – CHALK | ||||||
| CCK‐CHLK | CULVER CHALK FORMATION – CHALK | ||||||
| NCK‐CHLK | NEWHAVEN CHALK FORMATION – CHALK | ||||||
| SECK‐CHLK | SEAFORD CHALK FORMATION – CHALK | ||||||
| SNCK‐CHLK | SEAFORD CHALK FORMATION AND NEWHAVEN CHALK FORMATION (UNDIFFERENTIATED – CHALK | ||||||
| LECH‐CHLK | LEWES NODULAR CHALK FORMATION – CHALK | ||||||
| NPCH‐CHLK | NEW PIT CHALK FORMATION – CHALK | ||||||
| HCK‐CHLK | HOLYWELL NODULAR CHALK FORMATION – CHALK | ||||||
| ROWE‐CHLK | ROWE CHALK FORMATION – CHALK | ||||||
| FCK‐CHLK | FLAMBOROUGH CHALK FORMATION – CHALK | ||||||
| BCK‐CHLK | BURNHAM CHALK FORMATION – CHALK | ||||||
| WCK‐CHLK | WELTON CHALK FORMATION – CHALK | ||||||
| WHCK‐CHLK | WHITE CHALK SUBGROUP (UNDIFFERENTIATED) – CHALK | ||||||
| ZZCH‐CHLK | ZIGZAG CHALK FORMATION – CHALK | ||||||
| WMCH‐CHLK | WEST MELBURY MARLY CHALK FORMATION – CHALK | ||||||
| GYCK‐CHLK | GREY CHALK SUBGROUP (UNDIFFERENTIATED) – CHALK | ||||||
| CK‐CHLK | CHALK GROUP (UNDIFFERENTIATED) – CHALK | ||||||
| HUCK‐CHLK | HUNSTANTON FORMATION – CHALK | ||||||
| GUGS‐MDSL | GAULT FORMATION AND UPPER GREENSAND FORMATION (UNDIFFERENTIATED) – MUDSTONE, SANDSTONE AND LIMESTON | ||||||
| LGS‐STMD | LOWER GREENSAND GROUP – SANDSTONE AND MUDSTONE | ||||||
| W‐MDSS | WEALDEN GROUP – MUDSTONE, SILTSTONE AND SANDSTONE | Reservoir | Wealden beds, Tunbridge Wells Sand Formation | ||||
| W‐SDSL | WEALDEN GROUP – SANDSTONE AND SILTSTONE, INTERBEDDED | Reservoir | Wealden beds, Tunbridge Wells Sand Formation | ||||
| SYS‐SDST | SPILSBY FORMATION – SANDSTONE | ||||||
| PB‐LSMD | PURBECK GROUP – INTERBEDDED LIMESTONE AND MUDSTONE | Reservoir | Purbeck Group | Shale Gas | Purbeck Group Shales | ||
| LOCR‐SSML | LOWER CRETACEOUS (UNDIFFERENTIATED) – VARIED | ||||||
| PL‐LMCS | PORTLAND GROUP – LIMESTONE AND CALCAREOUS SANDSTONE | Reservoir | Portland Sand Formation,Portland Group, Portland Stone Formation | ||||
| KC‐MDST | KIMMERIDGE CLAY FORMATION – MUDSTONE | Source/Rese | Kimmeridge Clay Formation | Shale Gas | Kimmeridge Clay Formation | ||
| AMKC‐MDST | AMPTHILL CLAY FORMATION AND KIMMERIDGE CLAY FORMATION (UNDIFFERENTIATED) – MUDSTONE | Source/Rese | Kimmeridge Clay Formation | Shale Gas | Kimmeridge Clay Formation | ||
| CR‐LSSM | CORALLIAN GROUP – LIMESTONE, SANDSTONE, SILTSTONE AND MUDSTONE | Source/Rese | Beds within the Corallian Group | ||||
| WWAK‐MDSS | WEST WALTON FORMATION, AMPTHILL CLAY FORMATION AND KIMMERIDGE CLAY FORMATION (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| JURU‐MDSS | UPPER JURASSIC ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| KLOX‐MDSS | KELLAWAYS FORMATION AND OXFORD CLAY FORMATION (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | Source | Oxford Clay Formation | Shale Gas | Oxford Clay Formation | ||
| GOG‐MDST | GREAT OOLITE GROUP – MUDSTONE | Source/Rese | Fuller's Earth Formation, Frome Clay limestone, Forest Marble, Cornbrash Formation | Shale Gas | Fuller's Earth Formation | ||
| GOG‐SLAR | GREAT OOLITE GROUP – SANDSTONE, LIMESTONE AND ARGILLACEOUS ROCKS | Source/Rese | Great Oolite Limestone, Fuller's Earth Formation, Frome Clay limestone, Cornbrash Formation, Forest Marble | Shale Gas | Fuller's Earth Formation | ||
| INO‐LSSM | INFERIOR OOLITE GROUP – LIMESTONE, SANDSTONE, SILTSTONE AND MUDSTONE | Source/Rese | Inferior Oolite Group | ||||
| INO‐SDLI | INFERIOR OOLITE GROUP – SANDSTONE, LIMESTONE AND IRONSTONE | ||||||
| IOGO‐SLAR | INFERIOR OOLITE GROUP AND GREAT OOLITE GROUP (UNDIFFERENTIATED) – LIMESTONE, SANDSTONE AND MUDSTONE | Source/Rese | Inferior Oolite Group and Great Oolite Group, Fuller's Earth Formation | Shale Gas | Fuller's Earth Formation | ||
| RAG‐SDSM | RAVENSCAR GROUP – SANDSTONE, SILTSTONE AND MUDSTONE | ||||||
| JURM‐MDSL | MIDDLE JURASSIC ROCKS (UNDIFFERENTIATED) – MUDSTONE, SANDSTONE AND LIMESTONE | ||||||
| JURA‐MDLM | JURASSIC ROCKS (UNDIFFERENTIATED) – MUDSTONE AND LIMESTONE, INTERBEDDED | ||||||
| LI‐MSLS | LIAS GROUP – MUDSTONE, SILTSTONE, LIMESTONE AND SANDSTONE | Source/Rese | Bridport Sand Formation, Lias clays, Lower Lias Shales, Blue Lias Formation | Shale Gas | Lower Lias shales and Blue Lias | ||
| MMG‐MDSS | MERCIA MUDSTONE GROUP – MUDSTONE, SILTSTONE AND SANDSTONE | Source/Rese | Tarporley Siltstone Formation and Mercia Mudstone Group | ||||
| BMS‐SDST | BROMSGROVE SANDSTONE FORMATION – SANDSTONE | ||||||
| OMS‐SDST | ORMSKIRK SANDSTONE FORMATION – SANDSTONE | Reservoir | Ormskirk Sandstone Formation | ||||
| WRS‐SDST | WILDMOOR SANDSTONE FORMATION – SANDSTONE | ||||||
| WLSF‐SDST | WILMSLOW SANDSTONE FORMATION – SANDSTONE | Reservoir | Wilmslow Sandstone Formation | ||||
| KDM‐SCON | KIDDERMINSTER FORMATION – SANDSTONE | ||||||
| SBS‐SDST | ST BEES SANDSTONE FORMATION – SANDSTONE | ||||||
| SSG‐SDSM | SHERWOOD SANDSTONE GROUP – SANDSTONE, SILTSTONE AND MUDSTONE | Reservoir | Sherwood Sandstone Group | ||||
| TRIA‐MDSS | TRIASSIC ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | TRIASSIC | |||||
| BRI‐SDST | BRIDGNORTH SANDSTONE FORMATION – SANDSTONE | ||||||
| ZG‐DLDO | ZECHSTEIN GROUP – DOLOMITISED LIMESTONE AND DOLOMITE | Reservoir | Roker or Seaham Formations | Shale Gas | Kupferschiefer/Marl slate | ||
| KNSF‐SDST | KINNERTON SANDSTONE FORMATION – SANDSTONE | Reservoir | Kinnerton Sandstone Formation | ||||
| CCO‐MDSS_2 | CUMBRIAN COAST GROUP – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| APY‐SCON | APPLEBY GROUP – INTERBEDDED SANDSTONE AND CONGLOMERATE | Reservoir | Collyhurst Sandstone Formation | ||||
| PRMT‐SARL | PERMIAN AND TRIASSIC ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| PUND‐MDSS | PERMIAN ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| PUND‐SCON | PERMIAN ROCKS (UNDIFFERENTIATED) – INTERBEDDED SANDSTONE AND CONGLOMERATE | ||||||
| WAWK‐SISDM | WARWICKSHIRE GROUP – SILTSTONE AND SANDSTONE WITH SUBORDINATE MUDSTONE | Source/Rese | Halesowen Formation, Upper Coal Measures | CBM/UCG | Westphalian C‐D | ||
| WAWK‐MSCI | WARWICKSHIRE GROUP – MUDSTONE, SILTSTONE, SANDSTONE, COAL, IRONSTONE AND FERRICRETE | Source/Rese | Halesowen Formation, Upper Coal Measures | CBM/UCG | Westphalian C‐D | ||
| WAWK‐SISDM_2 | WARWICKSHIRE GROUP – SILTSTONE AND SANDSTONE WITH SUBORDINATE MUDSTONE | Source/Rese | Halesowen Formation, Upper Coal Measures | CBM/UCG | Westphalian C‐D | ||
| PUCM‐MSCI | PENNINE UPPER COAL MEASURES FORMATION – MUDSTONE, SILTSTONE, SANDSTONE, COAL, IRONSTONE AND FERRICRETE | Source/Rese | Pennine Coal Measures Group | CBM/UCG | Westphalian A‐B | ||
| PSMCM‐MSCI | PENNINE MIDDLE COAL MEASURES FORMATION AND SOUTH WALES MIDDLE COAL MEASURES FORMATION (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE, SANDSTONE, COAL, IRONSTONE AND FERRICRETE | Source/Rese | Pennine Coal Measures Group | CBM/UCG | Westphalian A‐B | ||
| PSLCM‐MSCI | PENNINE LOWER COAL MEASURES FORMATION AND SOUTH WALES LOWER COAL MEASURES FORMATION (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE, SANDSTONE, COAL, IRONSTONE AND FERRICRETE | Source/Rese | Pennine Coal Measures Group | CBM/UCG | Westphalian A‐B | ||
| PCM‐MDSS | PENNINE COAL MEASURES GROUP – MUDSTONE, SILTSTONE AND SANDSTONE | Source/Rese | Pennine Coal Measures Group | CBM/UCG | Westphalian A‐B | ||
| CM‐MDSS | COAL MEASURES FORMATION – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| MARR‐MDSD | MARROS GROUP – MUDSTONE AND SANDSTONE INTERBEDDED | Shale Gas | Marros Group | ||||
| MG‐MDSS | MILLSTONE GRIT GROUP – MUDSTONE, SILTSTONE AND SANDSTONE | Source/Rese | Silsden Formation, Pendleton Formation, Namurian Shales | ||||
| SMGP‐LSSM | STAINMORE FORMATION – LIMESTONE, SANDSTONE, SILTSTONE AND MUDSTONE | ||||||
| UIICP‐DBAT_3 | UNNAMED IGNEOUS INTRUSION, CARBONIFEROUS TO PERMIAN – DOLERITE AND THOLEIITIC BASALT | ||||||
| SMGP‐LSSM_2 | STAINMORE FORMATION – LIMESTONE, SANDSTONE, SILTSTONE AND MUDSTONE | ||||||
| AG‐LSSA | ALSTON FORMATION – LIMESTONE WITH SUBORDINATE SANDSTONE AND ARGILLACEOUS ROCKS | Source/Rese | Asbian and Brigantian substage rocks | ||||
| UIICP‐DBAT | UNNAMED IGNEOUS INTRUSION, CARBONIFEROUS TO PERMIAN – DOLERITE AND THOLEIITIC BASALT | ||||||
| AG‐LSSA_2 | ALSTON FORMATION – LIMESTONE WITH SUBORDINATE SANDSTONE AND ARGILLACEOUS ROCK | ||||||
| CRAV‐MDLM | CRAVEN GROUP – MUDSTONE AND LIMESTONE, INTERBEDDED | Source | Bowland Shale Formation, Lower Bowland Shales, Widmerpool Formation, Bee Low Limestone | Shale Gas | Upper Bowland Shale Formation and Lower Bowland Shale Formation | ||
| YORE‐LSSA | YOREDALE GROUP – LIMESTONE WITH SUBORDINATE SANDSTONE AND ARGILLACEOUS ROCKS | Shale Gas | Yoredale Group Shales | ||||
| TYLS‐LMAS | TYNE LIMESTONE FORMATION – LIMESTONE, ARGILLACEOUS ROCKS AND SUBORDINATE SANDSTONE, INTERBEDDED | ||||||
| UIICP‐DBAT_2 | UNNAMED IGNEOUS INTRUSION, CARBONIFEROUS TO PERMIAN – DOLERITE AND THOLEIITIC BASALT | ||||||
| TYLS‐LMAS_2 | TYNE LIMESTONE FORMATION – LIMESTONE, ARGILLACEOUS ROCKS AND SUBORDINATE SANDSTONE, INTERBEDDED | ||||||
| BDR‐SARL | BORDER GROUP – SANDSTONE WITH SUBORDINATE ARGILLACEOUS ROCKS AND LIMESTONE | ||||||
| UEXCL‐LATM_3 | UNNAMED EXTRUSIVE ROCKS, DINANTIAN – MAFIC LAVA AND MAFIC TUFF | ||||||
| INV‐SDSM | INVERCLYDE GROUP – SANDSTONE, SILTSTONE AND MUDSTONE | ||||||
| DINA‐LMST | DINANTIAN ROCKS – LIMESTONE | Reservoir | Asbian and Brigantian substage rocks, Woo Dale Limestone | ||||
| DINA‐MDLM | DINANTIAN ROCKS – MUDSTONE AND LIMESTONE, INTERBEDDED | ||||||
| HOWY‐MDSS | HOLSWORTHY GROUP – MUDSTONE, SILSTONE AND SANDSTONE | ||||||
| TEVYT‐MDSS | TEIGN VALLEY GROUP AND TINTAGEL GROUP (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| CARB‐ROCK | CARBONIFEROUS ROCKS (UNDIFFERENTIATED) – VARIED | Source/Rese | Pennine Coal Measures Group, Namurian Sandstones, Namurian Shales, Asbian and Brigantian substage rocks, Bowland Shale Formation, Lower Bowland Shales, Widmerpool Formation, Bee Low Limestone, Mid‐Dinantian shales and Milldale Limestone | Shale Gas | Bowland Shale Formation | ||
| DINA‐LSSA | DINANTIAN ROCKS (UNDIFFERENTIATED) – LIMESTONE WITH SUBORDINATE SANDSTONE AND ARGILLACEOUS ROCKS | Source/Rese | Asbian and Brigantian substage rocks, Bowland Shale Formation, Lower Bowland Shales, Widmerpool Formation, Bee Low Limestone, Mid‐Dinantian shales and Milldale Limestone | Shale Gas | Bowland Shale Formation | ||
| DINA‐SLAR | DINANTIAN ROCKS (UNDIFFERENTIATED) – SANDSTONE, LIMESTONE AND ARGILLACEOUS ROCKS | Source/Rese | Asbian and Brigantian substage rocks, Bowland Shale Formation, Lower Bowland Shales, Widmerpool Formation, Bee Low Limestone, Mid‐Dinantian shales and Milldale Limestone, Onecote Sandstone, Minera Formation | Shale Gas | Bowland Shale Formation | ||
| UEXCL‐LATF | UNNAMED EXTRUSIVE ROCKS, DINANTIAN – FELSIC LAVA AND FELSIC TUFF | ||||||
| UEXCL‐LATM | UNNAMED EXTRUSIVE ROCKS, DINANTIAN – MAFIC LAVA AND MAFIC TUFF | ||||||
| UEXSD‐LATM | UNNAMED EXTRUSIVE ROCKS, SILURIAN TO DEVONIAN – MAFIC LAVA AND MAFIC TUFF | ||||||
| UDEV‐BRCMBR | UPPER DEVONIAN ROCKS – ROSELAND BRECCIA | ||||||
| UIID‐UMFT | UNNAMED IGNEOUS INTRUSION, DEVONIAN – ULTRA MAFIC IGNEOUS‐ROCK | ||||||
| SAG‐SCON | STRATHEDEN GROUP – INTERBEDDED SANDSTONE AND CONGLOMERATE | ||||||
| UIID‐MFIR | UNNAMED IGNEOUS INTRUSION, DEVONIAN – MAFIC IGNEOUS‐ROCK | ||||||
| UDEV‐MDSS | UPPER DEVONIAN ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| UDEV‐SCON | UPPER DEVONIAN ROCKS (UNDIFFERENTIATED) – INTERBEDDED SANDSTONE AND CONGLOMERATE | ||||||
| UDEV‐MDSS_2 | UPPER DEVONIAN ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| MUDEV‐MDSS | MIDDLE AND UPPER DEVONIAN (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| MDEV‐SCON | MIDDLE DEVONIAN (UNDIFFERENTIATED) – INTERBEDDED SANDSTONE AND CONGLOMERATE | ||||||
| MDEV‐MDSS | MIDDLE DEVONIAN (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| LDEV‐SCON_1 | LOWER DEVONIAN ROCKS (UNDIFFERENTIATED) – INTERBEDDED SANDSTONE AND CONGLOMERATE | ||||||
| MDEV‐SCON_2 | MIDDLE DEVONIAN (UNDIFFERENTIATED) – INTERBEDDED SANDSTONE AND CONGLOMERATE | ||||||
| MDEV‐MDSS_2 | MIDDLE DEVONIAN (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| UEXSD‐LATM_1 | UNNAMED EXTRUSIVE ROCKS, SILURIAN TO DEVONIAN – MAFIC LAVA AND MAFIC TUFF | ||||||
| LDEV‐MDSS | LOWER DEVONIAN ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| LDEV‐SCON | LOWER DEVONIAN ROCKS (UNDIFFERENTIATED) – INTERBEDDED SANDSTONE AND CONGLOMERATE | ||||||
| LDEV‐MDSS_2 | LOWER DEVONIAN ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| LORS‐CSSM | LOWER OLD RED SANDSTONE – CONGLOMERATE, SANDSTONE, SILTSTONE AND MUDSTONE | ||||||
| DEV‐MDSS | LOWER DEVONIAN ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| DEV‐HBSCH | DEVONIAN ROCKS (UNDIFFERENTIATED) – HORNBLENDE SCHIST | ||||||
| DEV‐ROCK | DEVONIAN ROCKS, UNDIVIDED – VARIED | ||||||
| DEV‐SCHM_1 | DEVONIAN ROCKS (UNDIFFERENTIATED) – MICA SCHIST | ||||||
| UIICP‐FELSR | IGNEOUS INTRUSION, PERMO‐CARBONIFEROUS – GRANITE | ||||||
| UEXD‐MFTUF | UNNAMED EXTRUSIVE ROCKS, DEVONIAN – MAFIC TUFF | ||||||
| PRID‐MDSS | PRIDOLI ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| LUDL‐MDSS | LUDLOW ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| SILU‐LMCM_2 | SILURIAN ROCKS, UNDIFFERENTIATED) – LIMESTONE (AYMESTRY AND WENLOCK LIMESTONES | ||||||
| LUDL‐MDSS_2 | LUDLOW ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| UEXSD‐LATM4 | UNNAMED EXTRUSIVE ROCKS, SILURIAN TO DEVONIAN – MAFIC LAVA AND MAFIC TUFF | ||||||
| RCN‐WACKE | RICCARTON GROUP – WACKE | ||||||
| SILU‐LMCM | SILURIAN ROCKS (UNDIFFERENTIATED) – LIMESTONE, MUDSTONE AND CALCAREOUS MUDSTONE | ||||||
| WEN‐MDSS_2 | WENLOCK ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| WEN‐SCON_2 | WENLOCK ROCKS (UNDIFFERENTIATED) – INTERBEDDED SANDSTONE AND CONGLOMERATE | ||||||
| WEN‐MDSS | WENLOCK ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| HWK‐WACKE | HAWICK GROUP – WACKE | ||||||
| LDVY‐MDSS | LLANDOVERY ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| LDVY‐SCON | LLANDOVERY ROCKS (UNDIFFERENTIATED) – INTERBEDDED SANDSTONE AND CONGLOMERATE | ||||||
| LDVY‐MDSS_2 | LLANDOVERY ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| UEXSD‐LATF | UNNAMED EXTRUSIVE ROCKS, SILURIAN TO DEVONIAN – FELSIC LAVA AND FELSIC TUFF | ||||||
| SILU‐SCON | SILURIAN ROCKS (UNDIFFERENTIATED) – INTERBEDDED SANDSTONE AND CONGLOMERATE | ||||||
| SILU‐MDSS | SILURIAN ROCKS, UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| WEN‐SCON | WENLOCK ROCKS (UNDIFFERENTIATED) – INTERBEDDED SANDSTONE AND CONGLOMERATE | ||||||
| SILU‐MDSS_2 | SILURIAN ROCKS, (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| ASHL‐MDSS | ASHGILL ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| ORD‐FTUFF | ORDOVICIAN VOLCANIC ROCKS AND SILLS (UNDIFFERENTIATED) – TUFF | ||||||
| CARA‐MDSS | CARADOC ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| UIIOS‐FELSR_2 | UNNAMED IGNEOUS INTRUSION, ORDOVICIAN TO SILURIAN – FELSIC‐ROCK | ||||||
| ORD‐FTUFF_3 | ORDOVICIAN VOLCANIC ROCKS AND SILLS (UNDIFFERENTIATED) – TUFF | ORDOVICIAN | |||||
| ORD‐FTUFF_4 | ORDOVICIAN VOLCANIC ROCKS AND SILLS (UNDIFFERENTIATED) – TUFF | ||||||
| UIIOS‐MFIR_2 | UNNAMED IGNEOUS INTRUSION, ORDOVICIAN TO SILURIAN – MAFIC IGNEOUS‐ROCK | ||||||
| LLVN‐MDSS | LLANVIRN ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| ORD‐FTUFF_5 | ORDOVICIAN VOLCANIC ROCKS AND SILLS (UNDIFFERENTIATED) – TUFF | ||||||
| LLVN‐MDSS_2 | LLANVIRN ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ORDOVICIAN | |||||
| ARNG‐MDSS | ARENIG ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| UEXO‐MFLAVA_2 | UNNAMED EXTRUSIVE ROCKS, ORDOVICIAN – MAFIC LAVA | ||||||
| ORD‐MDSS_2 | ORDOVICIAN ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| TREM‐MDSS | TREMADOC ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| ORD‐FLAVA | ORDOVICIAN ROCKS (UNDIFFERENTIATED) – FELSIC LAVA | ||||||
| UEXO‐MFTUF | UNNAMED EXTRUSIVE ROCKS, ORDOVICIAN – MAFIC TUFF | ||||||
| ORD‐MDSS_3 | ORDOVICIAN ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| CAOR‐MDSS | CAMBRIAN AND ORDOVICIAN ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| CAMN‐MDSS | CAMBRIAN ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| UC‐MDSS | UPPER CAMBRIAN, INCLUDING TREMADOC – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| UIIO‐GN_4 | INTRUSIVE IGNEOUS ROCKS, ORDOVICIAN – GRANITE, FOLIATED | ||||||
| MC‐MDSS | MIDDLE CAMBRIAN – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| LRC‐SCON | LOWER CAMBRIAN ROCKS (UNDIFFERENTIATED) – INTERBEDDED SANDSTONE AND CONGLOMERATE | ||||||
| LRC‐MDSS | LOWER CAMBRIAN ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTOE AND SANDSTONE | ||||||
| UEXAZ‐FTUFF | UNNAMED EXTRUSIVE ROCKS, NEOPROTEROZOIC – PADARN TUFF | ||||||
| UIIN‐GN | INTRUSIVE IGNEOUS ROCKS – GRANITE, FOLIATED | ||||||
| CAOR‐MDSS_2 | CAMBRIAN AND ORDOVICIAN ROCKS (UNDIFFERENTIATED) – MUDSTONE, SILTSTONE AND SANDSTONE | ||||||
| LPRU‐ROCK | LOWER PALAEOZOIC ROCKS, UNDIVIDED – VARIED | ||||||
| UIICP‐FELSR_1 | IGNEOUS INTRUSION, PERMO‐CARBONIFEROUS – GRANITE | ||||||
| APRZ‐ROCK | PROTEROZOIC TO PALAEOZOIC ROCKS (UNDIFFERENTIATED) – VARIED | ||||||
| AZRU‐ROCK | NEOPROTEROZOIC ROCKS, UNDIVIDED – VARIED | ||||||
| AZRU‐GD | AVALONIAN PROTEROZOIC CRYSTALLINE BASEMENT – IGNEOUS ROCK, MAFIC | ||||||
| UIIEO‐FELSR | UNNAMED IGNEOUS INTRUSION, CAMBRIAN TO ORDOVICIAN – FELSIC‐ROCK | ||||||
| CHA‐VCSD | CHARNIAN SUPERGROUP – VOLCANICLASTIC ROCKS (BOTH PYROCLASTIC & REWORKED VOLCANIC ROCKS) | ||||||
| UIAZ‐UMR | UNNAMED IGNEOUS INTRUSION, NEOPROTEROZOIC – ULTRAMAFIC‐ROCK | ||||||