Cretaceous Stratigraphy of Lower Murchison River Area, 25 
Western Australia. 
The iolloAviiig- subdiA'isions of the Mnrehison House series are here pro- 
posed : — 
Name. 
Lithology. 
Fossils. 
Thickness 
in feet. 
Second Gully 
Shale 
Light green glauconitic shales 
92 -h 
Toolonga 
Chalk 
Mr)stly pure chalk, sometimes 
glauconitic ; in many places 
with a 6in. layer of phosphatic 
nodules at the base and 
Aisually rich in chert nodules 
in the Aipper part. 
Foraminifera, Cidaris^ 
Marsupites^ Uintacri- 
71US, Oryphaeai Ino- 
cera?7ius, brachiopods 
35-120 
Alinga Beds 
Glauconitic shales, often sandy 
and with greensand i)ockets, 
grading into greensand 
Beleranites 
10-75 
Thirindine 
Shale 
Whitish to grey, siliceous shale, 
sometimes more massive and 
grading into siltstone 
Very ])Oor belemnite frag- 
ments, rare 
0-63 
Butte 
Sandstone 
Predominantly unbedded pure 
ejuartz sandstone, mostly loose- 
ly cemented or incoherent 
(“ running sand ”) ; upper- 
most part usually ferruginous 
and glauconitic 
Vertical and oblique 
burrows, fossil Avood 
(rare) 
75-170 
Tumblagooda 
Sandstone 
Predominantly ivddish and 
purple sandstones, as a rule 
strongly cross-bedded, but 
grading into well-bedded sand- 
stones above 
Vertical burrows and in- 
vertebrate trails on 
bedding planes 
400+ 
Text Fig. 3. 
Selected (3ohimaar sections of the Murchison House Series above 
the Tiimblagooda Sandstone. The positions of these and other 
measured sections are indicated on Plate II. 
