0
6
Q
GRAVEL
CALCRETE
Pebbly surface lag and underlying calcrete.
Strat Unit Name
Quaternary rocks
Strat Unit Description
Undifferentiated Quaternary rocks.
GIS Code
IH
6
44.77
Nhwsts
SANDSTONE
Fine- to medium-grained, well sorted, massive to weakly cross-bedded sandstone.
Strat Unit Name
Simmens Quartzite Member
Strat Unit Description
Quartzite, blocky; sandstone, cream.
GIS Code
N-hwsts
44.77
63.69
Nhwstc
SANDSTONE
SILTSTONE
Very fine-grained to medium-grained micaceous sandstone, siltstone and shale.
Strat Unit Name
Corraberra Sandstone Member
Strat Unit Description
Sandstone, red, purple, slumped, silty. Some shale.
GIS Code
N-hwstc
63.69
215.76
Nhwstt
SHALE
SILTSTONE
Shale, silty shale and siltstone. Minor fine-grained cross-bedded sandstone.
Strat Unit Name
Tregolana Shale Member
Strat Unit Description
Shale, red and green; siltstone.
GIS Code
N-hwstt
215.76
240.95
Nhwss
SANDSTONE
Sandstone
Strat Unit Name
Seacliff Sandstone
Strat Unit Description
Quartzite; sandstone; siltstone.
GIS Code
N-hwss
240.95
241.52
Nhwsn
SHALE
DOLOMITIC LIMESTONE
Shale and dolomitic limestone
Strat Unit Name
Nuccaleena Formation
Strat Unit Description
Dolomite, thin, laminated, micritic, with interbedded shale near the top.
GIS Code
N-hwsn
241.52
242.52
Nhueh
SANDSTONE
SHALE
Interbedded very fine-grained sandstone, siltstone and shale. Coarser sandstone with well-rounded quartz grains at base.
Strat Unit Name
Whyalla Sandstone
Strat Unit Description
Sandstone, coarse-grained, bimodal, with large-scale crossbedding, sand grains very well rounded, spherical.
GIS Code
N-hueh
242.52
258.5
M-p
CONGLOMERATE
Purple, well sorted, polymodal conglomerate consisting dominantly of well-rounded to subrounded, hematite-coated quartz clasts. Matrix of f-mgr sandstone and very fine silt.
Strat Unit Name
Pandurra Formation
Strat Unit Description
Sandstone, quartz and lithic, m.g.-c.g., poorly sorted; sandstone, well-sorted, v.f.g.-m.g.; conglomerate, granule to pebble; mudstone; siltstone. Red, brown or purple with reduction spotting or mottling. Fluvial, large-scale cross-bedding and liesegang banding. Maximum deposition 1424±51 Ma (Rb-Sr).
GIS Code
M----p
258.5
300
M-p
SANDSTONE
Gritty sandstone with rounded to subangular quartz grains. Matrix of finer quartz grains and white clay and trace micas. Occasional hematised shale clasts. Massive to cross-bedded, some mm-scale colour lamination.
Strat Unit Name
Pandurra Formation
Strat Unit Description
Sandstone, quartz and lithic, m.g.-c.g., poorly sorted; sandstone, well-sorted, v.f.g.-m.g.; conglomerate, granule to pebble; mudstone; siltstone. Red, brown or purple with reduction spotting or mottling. Fluvial, large-scale cross-bedding and liesegang banding. Maximum deposition 1424±51 Ma (Rb-Sr).
GIS Code
M----p
300
307.6
N-g
DOLERITE
Dolerite dyke
Strat Unit Name
Gairdner Dolerite
Strat Unit Description
Dolerite dykes locally intruded by black porphyritic basalt. Sm-Nd ages 867+/-47 and 802+/-35Ma; U-Pb age 827+/-6Ma.
GIS Code
N----g
307.6
328.4
M-p
SANDSTONE
Gritty sandstone with rounded to subangular quartz grains. Matrix of finer quartz grains and white clay and trace micas. Occasional hematised shale clasts. Massive to cross-bedded, some mm-scale colour lamination.
Strat Unit Name
Pandurra Formation
Strat Unit Description
Sandstone, quartz and lithic, m.g.-c.g., poorly sorted; sandstone, well-sorted, v.f.g.-m.g.; conglomerate, granule to pebble; mudstone; siltstone. Red, brown or purple with reduction spotting or mottling. Fluvial, large-scale cross-bedding and liesegang banding. Maximum deposition 1424±51 Ma (Rb-Sr).
GIS Code
M----p
328.4
423.65
N-g
DOLERITE
BASALT
Dolerite dyke. Two small feldspar-phyric basaltic dykes (melaphyr) near base. Thin sandstone interval near top.
Strat Unit Name
Gairdner Dolerite
Strat Unit Description
Dolerite dykes locally intruded by black porphyritic basalt. Sm-Nd ages 867+/-47 and 802+/-35Ma; U-Pb age 827+/-6Ma.
GIS Code
N----g
423.65
432
M-p
SANDSTONE
Gritty sandstone with rounded to subangular quartz grains. Occasional pebble bands showing reverse graded bedding, chiefly angular to subangular quartz, minor hematised shale and porphyry (GRV) clasts.
Strat Unit Name
Pandurra Formation
Strat Unit Description
Sandstone, quartz and lithic, m.g.-c.g., poorly sorted; sandstone, well-sorted, v.f.g.-m.g.; conglomerate, granule to pebble; mudstone; siltstone. Red, brown or purple with reduction spotting or mottling. Fluvial, large-scale cross-bedding and liesegang banding. Maximum deposition 1424±51 Ma (Rb-Sr).
GIS Code
M----p
432
434.25
? N-g
BASALT
Black feldspar-phyric basaltic dyke (melaphyr).
Strat Unit Name
Gairdner Dolerite
Strat Unit Description
Dolerite dykes locally intruded by black porphyritic basalt. Sm-Nd ages 867+/-47 and 802+/-35Ma; U-Pb age 827+/-6Ma.
GIS Code
N----g
434.25
499.5
M-p
SANDSTONE
Gritty sandstone with rounded to subangular quartz grains. Occasional pebble bands showing reverse graded bedding, chiefly angular to subangular quartz, minor hematised shale and porphyry (GRV) clasts. Coarser pebbly bands increasing towards base.
Strat Unit Name
Pandurra Formation
Strat Unit Description
Sandstone, quartz and lithic, m.g.-c.g., poorly sorted; sandstone, well-sorted, v.f.g.-m.g.; conglomerate, granule to pebble; mudstone; siltstone. Red, brown or purple with reduction spotting or mottling. Fluvial, large-scale cross-bedding and liesegang banding. Maximum deposition 1424±51 Ma (Rb-Sr).
GIS Code
M----p