0
4
TQ
CLAY (UNDIFF. ORIGIN)
SAND
Fine gr. sandy clay and grit
Strat Unit Name
Tertiary-Pleistocene rocks
Strat Unit Description
Undifferentiated Tertiary to Pleistocene rocks.
GIS Code
aI
4
10
Nhwstt
SHALE
SILTSTONE
Shale with irregularly scattered siltstone layers
Strat Unit Name
Tregolana Shale Member
Strat Unit Description
Shale, red and green; siltstone.
GIS Code
N-hwstt
10
46
Nhueh
SILTSTONE
SANDSTONE
Siltstone over fine-coarse gr. sandstone
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
46
166.2
Nhunt
SILTSTONE
DOLOMITE ROCK
Fissile vaguely laminated siltstone with dolomite laminae
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
166.2
173.8
Nxcae
MAFIC EXTRUSIVE
Basic volcanic with leucoxene, pyroxene, CO3, fspar, magnetite, chlorite
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
173.8
179
M-p
SANDSTONE
Fine-coarse gr. sandstone with well rounded gr. of qtz, qtzt, BIF etc
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