VOLCANIC ROCKS.—CASE V. 
Case VI. 
NEWER VOLCANIC—(continued). 
59. BasaLtic Lava (Scoriaceous). 
Mount Shadwell. ý 
Color blackish-grey ; vesicles much 
compressed and flattened, giving to the 
rock an appearance of a fissile or lami- 
nated structure. Somewhat resembles 
specimen No. 42. 
, VESICULAR BASALT. 
69 Map No. Ra 102. 
«Farmers Arms,? Carisbrook. 
4 sheet 52 N.E. 
In part amygdaloidal. 
61, VESICULAR BASALT. 
Near Malmsbury. 4 sheet 9 N.W. 
Texture dense; vesicles compressed 
and elongated. 
614, BASALT. 
Barfold Co?s Shaft, Barfold, 
Campaspe River. 4 sheet 13 
S.E 
Black and vesicular, with cavities 
containing botryoidal coatings of carbo- 
nate of lime (ferro-calcite). An analysis 
by Mr. J. C. Newbery, after separation 
of the carbonate of lime, gave :— 


Soluble Insoluble 
portion. portion. 
Silica .. .. 3571 5416 
Alumina ++ 40°11 rat 19:27 
Iron, sesqui-oxide .. 13°66 { rane } 14°08 
Lime T ss 1°07, . 314 
Magnesia «- s+ 052 Ab vas 
Potash .. “02 “13 
Soda ve wins rs { 324 
Titanic acid .. se 1072 .. ap 
Manganese .- .. >è ae 0°28 
Water .. . 136 H 
99°18 102°15 


30°19 per cent. was soluble in hydrochloric acid. 
62. BasaLrt (Earthy Lava). 
List No. Rs 1. 
Mount Shadwell. À 
Color dull reddish ; encloses pieces 
of olivine, partly decomposed, and small 
ironstone pebbles. j 
63. VOLCANIC SCORIA. 
Mount Franklin. 4 sheet 15 S.E. 
Attached to this scoriaceous fragment 
isa piece of the subjacent rock (pro- 
bably Silurian slate), over which the 
lava flowed. 
64. VOLCANIC SCORIA. 
List No. Rs 1. 
Mount Shadwell, 
65. Basarmic Lava. 
List No. Rs 1. 
Mount Shadwell. 
Somewhat resembling No. 57, except 
that the central portion is as dense as 
the outer, and the peculiarity of struc- 
ture not so characteristically shown ; 
contains nests of olivine. 
66. VESICULAR SLAG. 
Map No. Ra 107. 
Newstead Road, Moolort. 4 sheet 
52 N.B. 
Shows the cooled surface of flowing 
lava. 
67 VOLANO Casi eb 
P SCORIA, 
Flat-topped hill, near Mortlake. 
Similar to specimen No. 64. 
68. VOLCANIC SCORIA. 
List No. Rs 1. 
Mount Shadwell. 
Very cellular; the cause of the 
marked difference in the color of the 
cells is uncertain. It encloses fragments 
of felspar (oligoclase). 
69. VOLCANIC ScoRIA. 
Mount Franklin. 4 sheet 15 
S.E. 
Dark, very cellular and light. 
70. VOLCANIC CORIA. 
Mount Elephant. 
Similar to others. 
71. VOLCANIC SCORIA. ‘ 
List No. Rs 1. 
Mount Shadwell. 
Vesicles large, giving the specimen 
the appearance of a piece of honey- 
comb, 
