1132 The Geoloyy of Central Australia. —{November, 
pan or salt lake glistening painfully white under the fierce sun; no 
animal life save a few kites (Milvus affinus and Elanus scriptus), the 
never-absent crow and mayhap a forlorn sandhill wallaby (Betton- 
gia grayi), and the deceitful mirage making everything seem weird 
and unreal. Such is the sight that greets the unhappy traveler 
until his eyes grow weary and his heart grows sick, yearning 
after cool streams and shady places. 
The table-topped hills are generally derived from the erosion 
of outcrops of the Cretaceous and Jurassic rocks ; in other cases 
from the compact zolian sandstone. The sandhills trend nearly 
north and south, generally a few degrees east of north, They 
show the true sand-drift structure, and have a sloping and an ab- 
rupt side. The direction of the trend is uniform over large areas. 
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A-A, parallel sandhills; B-ZB, crescent sandhills; 
If a sandy flat, to which the wind has free access, is exam” i 
will be seen that the sand has been blown into a series of seth 
or ridges, whose long axes are at right angles to the weer 
the wind, and on examining them closer it will be found tha e 
side towards the wind is sloping and the opposite abropk 
then we have in miniature the sandhill country. The a 
winds throughout the region are westerly and north-west ig 
the ridges trend at right angles with their sloping sida a 
the west or north-west. Where there is a decided van 
C-C, clay flats. 
