GEOLOGICAL SURVEY OF WESTERN AUSTRALIA FORTESCUE GROUP BULLETIN 144 PLATE 1C REFERENCE SYMBOLS Geological boundary............................................................ Mineral field boundary.......................................................... Ôa Ôx Ôm Fault Mineral field district boundary.............................................. exposed........................................................................... Mining group.......................................................................... WOODIE WOODIE concealed........................................................................ Mine or opencut from MINEDEX data (gold, unless Qa Alluvium_unconsolidated silt, sand, and gravel; in river channels Qx Undivided Quaternary deposits; includes colluvium, reworked alluvium, eolian sand, and clay reverse............................................................................. otherwise indicated)........................................................ Bamboo Creek Qm Clay, mud, silt, and sand; tidal and supratidal deposits, mangroves, lagoons, and coastal dunes Major folds, showing axial trace and generalized Closed mine or undeveloped deposit from MINEDEX plunge direction data................................................................................... CAINOZOIC Óx Ók Óp anticline; exposed, concealed....................................... Closed mine or undeveloped deposit from published syncline; exposed, concealed....................................... GSWA maps.................................................................... Czx Undivided Cainozoic deposits; includes partly consolidated colluvium and alluvium, and silcrete and laterite overturned anticline; exposed....................................... Mining area or ore stockpiles.............................................. Czk Calcrete_sheet carbonate; found along major drainage lines Bedding, showing strike and dip Mineral occurrence Czp ROBE PISOLITE: pisolite limonite deposits; developed along palaeodrainage lines PHANEROZOIC horizontal......................................................................... Antimony.......................................................................... Sb 5 inclined............................................................................ Asbestos, chrysotile........................................................ Ac âK Sandstone, conglomerate, siltstone, and mudstone; includes CALLAWA FORMATION, FREZIER SANDSTONE, JARLEMAI vertical............................................................................. Asbestos, crocidolite....................................................... Ad SILTSTONE, NANUTARRA FORMATION, PARDA FORMATION, WALLAL SANDSTONE, and YARRALOOLA CONGLOMERATE overturned....................................................................... 80 Barite................................................................................ Ba CRETACEOUS MESOZOIC JURASSIC AND strike and dip estimated from aerial photography Beryl................................................................................. Be 0ÝÊÝ15¾........................................................................ Building or dimension stone.......................................... Bs å Sandstone, conglomerate, siltstone, and mudstone; includes PATERSON FORMATION, GRANT GROUP, and POOLE SANDSTONE AND CANNING BASINS 15ÝÊÝ45¾...................................................................... Chromium......................................................................... Cr NORTHERN CARNARVON PERMIAN 45ÝÊÝ90¾...................................................................... Chrysoprase..................................................................... Chy PALAEOZOIC INTRUSIVE ROCKS Igneous layering, showing strike and dip Copper.............................................................................. Cu 20 inclined............................................................................ Diamond........................................................................... Di d Dolerite dykes, sills, and small intrusions (various ages) Isotopic age determination site with identification number, Fluorite............................................................................. F Fortescue Group only.................................................... 118920 Gemstone......................................................................... Gs Gold.................................................................................. Au ìS Quartz sandstone, siltstone, and mudstone; minor conglomerate BASIN Savory Group Highway with national route marker................................... Iron................................................................................... Fe Savory OFFICER Sub-basin Formed road.......................................................................... Lead.................................................................................. Pb Track...................................................................................... Limestone......................................................................... Ls c. 800 Ma ìU Fine- to coarse-grained sandstone, siltstone, mudstone, and stromatolitic and non-stromatolitic dolomite; minor conglomerate Group Gas pipeline.......................................................................... Lithium.............................................................................. Li Tarcunyah Railway................................................................................... Manganese...................................................................... Mn Airport.................................................................................... Mica.................................................................................. Mi c. 900 Ma ìT Throssell Group: quartzitic and micaceous sandstone, siltstone, mudstone, conglomerate, stromatolitic and PATERSON OROGEN Basin Airfield.................................................................................... Molybdenum.................................................................... Mo non-stromatolitic dolomite, and dolomitic conglomerate; includes Lamil Group Muttarbarty Hill Yeneena Landing ground..................................................................... Nickel............................................................................... Ni Yeneena Supergroup Townsite Niobium............................................................................ Nb c. 1600_1000 Ma ìM Sandstone, siltstone, mudstone, conglomerate, chert, stromatolitic and non-stromatolitic dolomite, and dolomitic sandstone, BASIN Group mudstone, and conglomerate population; less than 1000............................................. Point Samson Platinum group element................................................. PGE Bangemall BANGEMALL 1000ÝÊÝ10000................................................. Dampier Salt (solar evaporation).................................................. Na greater than 10000....................................... KARRATHA Silver................................................................................ Ag ìB Pebble to boulder conglomerate, pebbly sandstone, sandstone, siltstone, and mudstone BASIN Group Homestead............................................................................. Millstream Tantalum.......................................................................... Ta Bresnahan BRESNAHAN Building.................................................................................. Tin.................................................................................... Sn National Park boundary........................................................ Titanium........................................................................... Ti ìI Quartz sandstone, conglomerate, siltstone, and mudstone Basin Group Reserve boundary................................................................. Tungsten.......................................................................... W Mount Minnie Mount Minnie Horizontal control; major...................................................... Uranium........................................................................... U Vanadium......................................................................... V ìr CAPRICORN FORMATION: conglomerate, ferruginous and quartzitic sandstone, ferruginous siltstone and mudstone, Blair dolomite, and felsic volcanic rock Basin Watercourse........................................................................... Zinc................................................................................... Zn Lighthouse.............................................................................. Abandoned............................................................................. (abd) ìg Granodiorite, biotite-bearing and mainly coarse-grained; contains mafic xenoliths; intruded into Wyloo Group ìWa ASHBURTON FORMATION: mudstone, siltstone, thin- and thick-bedded sandstone; minor banded iron-formation, conglomerate, mafic and felsic volcanic rocks, and dolomite; metamorphosed ìWj JUNE HILL VOLCANICS: mafic lava, pillow lava, and volcaniclastic rock; includes intermediate and felsic c. 1840 Ma volcanic rock, sandstone, and dolomite; metamorphosed ìWd DUCK CREEK DOLOMITE: thin- to thick-bedded dolomite; local stromatolitic dolorudite; minor chert and argillite; metamorphosed CAPRICORN OROGEN PROTEROZOIC ìWm MOUNT McGRATH FORMATION: ferruginous sandstone and conglomerate,