Journal of the Royal Society of Western Australia, 86(2), June 2003 
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5 Nuendah Formation 
4 Gibson Formation 
3 Mulline Formation 
2 Westonia Formation 
1c Granite, upper saprolite 
1b Granite, lower saprolite 
la Granite, unweathered 
C2Z23 Dolerite 
— Fault 
YN4i Cored borehole 
— Bedrock-sediment 
unconformity 
B 
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Gravelly, clayey to 
muddy sand, framework 
-matrix supported 
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framework supported 
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Clayey sand 
Sandy clay 
Clay 
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Granite, lower saprolite 
Granite, saprock 
o 
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stratification 
Ferruginous mottle 
Pipe structure 
Labyrinthoid structure 
Granite 
Quartz vein 
Q Quartz 
K Kaolin 
Gi Gibbsite 
Go Goethite 
Hm Hematite 
F Feldspar 
Mica Biotite,muscovite 
✓WWN 
Unconformity 
Q,K ... Dominant or co-dominant phase 
q,k... Sub-dominant phase 
(q,k...) Minor phase 
Figure 3. A: Schematic geological section across the East Yornaning catchment. Cored boreholes YN41, YN43 and YN45 positioned with 
respect to regolith stratigraphy rather than exact geographic location. Depths to fresh and slightly weathered basement (saprock) 
provided by rotary air-blast holes. B: Legend for stratigraphic sections shown in Figs 3A, 4, 8 and 10. 
66 
