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Regolith landforms

and sandplains. They can be broadly GH¿QHG ZLWKLQ WZR PDLQ JURXSV FRQVLVWLQJ RI VKHHWÀRZ VHGLPHQWV &+ XQLWV )LJ   which occur over all the landforms mentioned, and colluvial sediments (C units, Fig. 2), which are found on HURVLRQDO ULVHV ÀDQNLQJ VRPH EHGURFN highs.

410000 Peck Hill

Koolka Hill

420000 " 'Old Telechie'

Tonga Hill

Alconie Hill

430000

Toraminga Hill

"'Kalabity'

440000

6470000

Wiperaminga Hill

7KH VKHHWÀRZ VHGLPHQWV DUH characterised by red-brown silts with angular to sub-angular quartzose and lithic sands and gravels. Some of the VKHHWÀRZ ODQGIRUPV DUH W\SL¿HG E\ a distinctive ‘contour-band’ surface pattern consisting of irregular sandy bands vegetated by bladder saltbush (Atriplex vesicaria) and/or black bluebush (Maireana pyramidata) between bands of sparse vegetation cover and pebbly VXUIDFH ODJV 6KHHWÀRZ GHSRVLWV RQ sandplains (CHps unit, Fig. 2; Fig. 4) ZLWKLQ %LPERZULH DUH FRPPRQ ÀDQNLQJ the major drainage lines in the NW. These ODQGIRUPV DUH W\SL¿HG E\ DQJXODU WR sub-angular quartzose sands with lesser silts and lithic fragments, and represent VKHHWÀRZ UHZRUNLQJ RI DHROLDQ PDWHULDOV derived from local alluvial channels.

The colluvial sediments (C units, Fig 2; Fig. 5) are characterised by boulders to cobbles of locally derived lithic fragments, with silts and sub- angular quartzose sands.

Alluvial sediments

Alluvial landforms include small drainage depressions and alluvial channels incising bedrock highs, and wide channels with alluvial plains draining the bedrock highs. The alluvial sediments within

Triangle Hill (Bimba Hill) Little Bimba Hill

6460000

Calico Hill Pimpena Hill

Boolcoomata Hill

BIMBOWRIE STATION

Mooleugore Hill

Bimbowrie Hill

( Antro Woolshed

"

'Bimbowrie'

Antro Feldspar Mine Ì

Binberrie Hill

6450000

'Old Boolcoomata'

Cathedral Rock

"

Drew Hill

Ameroo Hill

Outalpa Hill

Foote Hill 'Bulloo Creek'

"

6440000

ACar (Channel Deposits/ Alluvial Channel)

CHep (Sheet Flow Deposits/ Erosional Plain)

Cer (Colluvial Sediments/ Erosional Rise)

Aap (Alluvial Sediments/ Alluvial plain)

CHer1 (Sheet Flow Deposits/ Erosional Rise)

ISps (Aeolian Sands/ Sandplain)

Aed (Alluvial Sediments/ Drainage Depression

CHer2 (Sheet Flow Deposits/ Erosional Rise)

SSeh (Slightly Weathered Bedrock/Hills)

Afa (Alluvial Sediments/ Alluvial Plain)

CHfs (Sheet Flow Deposits/ Sheet-Flood Fan)

SSel (Slighly Weathered Bedrock/ Low Hills)

Apd1 (Alluvial Sediments/ Depositional Plain)

CHpd1 (Sheet Flow Deposits/ Depositional Plain)

SSep (Slightly Weathered Bedrock/ Erosional Plain

Apd2 (Alluvial Sediments/ Depositional Plain)

CHpd2 (Sheet Flow Deposits/ Depositional Plain)

SSer (Slightly Weathered Bedrock/ Erosional Rise)

CHps (Sheet Flow Deposits/ Sandplain)

Figure 2 Regolith landforms of Bimbowrie Station (after Burtt et al., 2005).

PIRSA 203159 034

_

Regolith

10 km

Figure 3 Slightly weathered quartz ironstone with thin skeletal soils, Peryhumuck Mine. (Photo 404913)

Figure 4 :HOO YHJHWDWHG VKHHWÀRZ GRPLQDWHG VDQG SODLQ %LPERZULH Station. (Photo 404915)

MESA Journal 41

April 2006

31

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