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