0
4
Q
SAND
CLAY (UNDIFF. ORIGIN)
unconsolidated calcareous sand and clay with minor pebbles
Strat Unit Name
Quaternary rocks
Strat Unit Description
Undifferentiated Quaternary rocks.
GIS Code
IH
4
27
Nhwstt
SILTSTONE
SANDSTONE
dark brown finely laminated siltstone with claystone and minor fine-grained sandstone, well rounded coarse granules more common toward base
Strat Unit Name
Tregolana Shale Member
Strat Unit Description
Shale, red and green; siltstone.
GIS Code
N-hwstt
27
43
? Nhueh
SANDSTONE
pale brown fine-grained sandstone, minor medium-grained sandstone and occassional well-rounded granules
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
43
162.2
Nhunt
SILTSTONE
SANDSTONE
dark grey to black laminated siltstone with minor sandstone, trace pyrite throughout
Strat Unit Name
Tapley Hill Formation
Strat Unit Description
Siltstone, grey to black, dolomitic and pyritic grading upwards to calcareous, thinly laminated, locally cross-bedded; dolomite, grey, flaggy to massive; limestone conglomerate, intraformational; greywacke.
GIS Code
N-hunt
162.2
175.3
Nxcae
BASALT
dense fine-grained green to grey volcanics
Strat Unit Name
Beda Basalt
Strat Unit Description
Basalt, amygdaloidal to massive, tholeiitic, subaerial, flows 1-30m thick, altered by chlorite, sericite, hematite, amphibole, epidote and K-feldspar.
GIS Code
N-xcae
175.3
176.4
Nxcak
SANDSTONE
poorly sorted sandstone with gradational upper contact, abundant calcite-filled vein networks
Strat Unit Name
Backy Point Formation
Strat Unit Description
Sandstone; conglomerate, pink to red, locally haematitic.
GIS Code
N-xcak