BY II. I. JENSEN. 599 



5. Name: Trachytic Noseau-Arfvedsonite-Leucitophyre. Mag- 

 matic name, Phlegrose. 



6. Chemical Note : this rock gelatinises strongly with acid and 

 takes stains. The absence of chlorine shows that sodalite is not 

 present, and the low percentage of SO3 shows that the almost 

 isotropic material which is a very abundant constituent (more 

 than 10% of the bulk) cannot be wholly nosean. The low CO 2 

 and HoO percentages of the rock, as well as the regular outlines 

 of the isotropic mineral, show that tliis cannot be a zeolite (amyg- 

 daloidal fillings). The investigation therefore indicates that it 

 it must be pseudoleucite. 



W.14L Loc: Tenandra Gap between Caraghnan and Mount 

 Berum Buckle. 



1. Handspecimen like W.140. 



2. Texture like W.140. 



3. Composition : the constituents are the same as in W.140, 

 with these differences : — the felspathoid minerals are less abun- 

 dant, segirine-augite is more abundant, exceeding soda-hornblende 

 in amount; and the latter mineral is a brownish variety allied 

 rather to barkevicite and cossyrite (?) than to arfvedsonite, and 

 is scattered about in minute grains and rods. The isotropic 

 minerals gelatinise with acids and take stains. 



4. Name : Trachytic Nosean Soda-amphibole Leucitophyre. 



W.138. Loc: A. ridge N.E. of Mount Berum Buckle. 



1. Handspecimen a mottled, uneven-grained yet fine-grained 

 greenish-grey rock. 



2. Texture : fabric trachytic, holocrystalline, porphyritic in 

 felspathoid. 



3. Composition : the felspar consists essentially of anorthoclase 

 in laths, ^girine, arfvedsonite and brownish soda-amphibole 

 are represented. A few cubes of magnetite are present. 



4. Name : Trachytic Nosean-Pseudoleucite Trachyte. 



Note: the last four rocks here described, viz., W.222, W.140, 

 W.141 and W.138, are closely allied, and belong to the group of 

 the phonolites. In the Warrumbungles this rock-type (typified 



