Cretaceous Stratigraphy* of Lower ^Murchison River Area, 37 
Western Australia. 
Text Fig. 12. 
Alinga Point. The darker greensands of the Alinga Beds 
forming the lower part of the slope are overlain by light-coloured 
Toolonga Chalk. 
Hills. The pri'sei-vation of these fossils is as a rule very poor, the guards 
Aveatherinsr (‘asily on exposure. 
Thicl'ii^ss . — The thickness is small in the east. East of the telegra])h 
line it is only 18 feet, increasing gradually to about 75 feet in the Pill- 
uraAva section. West of this there is again a decrease in thickness to 
10 feet near the west end of Toolonga Hills followed by a rapid increase 
in the cliffs north of Yalthoo windmill to 00 feet. On the east side of 
Second dully the thickness has decreased to 25-30 feet and nenr Alingii 
it increases again to 55 feet. At M'eanarra there are about 22 feet of 
Alinga Beds. 
(). Toolonga Chalk. 
Derivation of name . — Toolonga Hills is the name of the highest ])art 
(about OOO feet above sea level) of the scarp 7iorth-west of the 5furchi- 
son River. This scarp of Avhite rocks is visiblf' from the plateau south 
of the river many miles away. 
Area] (llstrihnfion a^irl ontcrops . — The Toolonga Chalk is widely dis- 
tributed over the area. It forms the top of the coastal cliffs north of 
the ^rurcl'i ;nn River at least as far as several miles to the north of 
Nungajay S]n'ing% hut probably mueh farther. Outcrops along the coast 
are not good, because the slopes are everywhere covered with a crust 
of hard secondary travertine (“duricrust’’) and the chalk can only he 
