Kkx T. Prider. 
1 22 
A. B. C. t). 
Text -llistoii'ninis (if visunl projection roumlness and visual projeetiois, 
si)lievieity (based on ineasnreinent of 200 grains) of: — 
A. Yellow sand, Crawley, W.A. (22S04), 
B. Yellow sand, Ridge Hill, W.A. (21364). 
(A Wdlow sand, Ridge Hill, W.A. (22802). 
D. Insolulile residue in ferruginous sandstone, Ridge Hill, W.A. (2279SC 
there is some variation in llie uuM'lianieal eoiniiositioii of the Ividge Hill 
yellow sand. Thei’e are no availal>le data eoiieerniug the variation in 
eoiu])osition of the nielro])olilan yelhiw sand. In their meeliauieal com- 
position all tile samples examined are very similar. The ferruginous sand- 
stones lunvev(‘r contain, as has been noted atiove, an allophanoid with 
tuberose form- this material is ab>eiit from the yellow sand. That this 
allophanoid jiei’sists in the soils formed over the fervuginoiis sandstones 
and low-level laterile is evidenced by its presence in the pebbly and sandy 
soil overlying the low-level laterite or ferruginous sandstone from a 
locality five eliains sonth-west from the 14-mile peg on the railway line i.e. 
two chains east of the easlern lioundai’v oi' the yellow sand. The presence 
of this allophanoid in the soils over llie ferruginous sandstones and low- 
level laterite and its absence in the yellow sand two chains farther west 
indicates that the y^dlow sands are not residual deposits from the ferru- 
ginous sandstone series. 
Tlie heavy mineral scpai'ations indicate that the yellow sands of Ridge 
Hill eontaiji a mueh higher propoi’tion of ‘dieavies’’ than the Crawley 
sand but in both the Ridge Hill and (^rawdey sands the “heavies^’ tend to 
