32 
E. DE C. Clarke and C. Teichert. 
3. Butte Sandstone. 
Derivation of name . — Small prominent conical hill (butte) on south side 
of Second (hilly (text fig’. 10), where the greatest thickness (170 feet) 
of this sandstone was measured. 
Text Fig. 10. 
Second Gully seen from the north. In the centre is the butte 
with capping of Thirindine Shale, underlain by Butte Sandstone 
which extends nearly to tlie \alley floor. The scarp on the other 
side of the valley consists of Toolonga Chalk and Second Gully Shale. 
In the foi'eground is the hardened surface (duricrust) of the latter. 
Areal distribiiiion. and outcrops . — The Butte Sandstone forms the base 
of the scarp everywhere north of the Murchison River and can be traced 
all the way from the telegraph line to Mullewa Point, a mile or so from 
the coast. From the foot of the scar]> there extends a strongly dis- 
sected shelf of varying wddth which is covered with hiose sand, consisting, 
at least in jiart, of disintegrated Butte Sandstone (text fig 2). Although 
part of this loos(‘ sand may be derived from the to]> layers of the Tum- 
blagooda Sandstone, the whole of this shelf area has been included on 
our map in the upper part of the Gretaceous series which begins with 
the Butte Sandstone. The Butte Sandstone is not exposed along the 
coast, 'where it is probably buried under younger deposits of sand and 
“coastal limestone.” There is reason to suppose that it forms the base 
of Meanarra Hill, south of the Murchison Kiver, but no exposures have 
been seen. 
