VOLCANIC ROCKS.—CASE IV. ~ 21 
34. BASALTIC CLAY. 
List No. R (oB 1). 
Hill between Korkuperrimul Creek 
and Lerderderg River, near 
Bacchus Marsh. 
Greenish-grey and red colored base, 
with spots of white hydro-silicate of 
alumina, giving the rock a porphyritic 
appearance, 
35. DECOMPOSED BASALT. 
Map No. Rd 40. 
Batman’s Hill, Melbourne. } sheet 
1 S.E. 
Color dark. grey and red mottled, 
with veins and patches of white, mag- 
nesian clay, stained with iron, 
36. DECOMPOSED BASALT. 
Map No. Rd 40. 
Same locality as last, 
Same as No. 35, but in a more disin- 
tegrated condition, and with a larger 
proportion of white clay. 
37. BASALT: Map No. R „Wp L 
Section 116, Darriwell. % sheet 
19 S.W. 
Color 
In process of decomposition. 
olive-brown, speckled with red, the re- 
sult of the conversion of an embedded 
mineral into hydrous oxide of iron, 
Texture fine-grained granular. 
38. BASALT. Map No. R miig L 
Section 116, Darriwell. % sheet 
19 S.W. 
Of a light reddish-grey color, earthy 
and fine granular in texture ; in process 
of decomposition. 
39. BASALT. Map No. R „Wp L 
Same locality as last. 
Similar to No. 38. Shows a few vesi- 
cular cavities. 
40. BASALT. Map No. mip | 
Same locality as last. 
Color greyish oliye-brown, surface 
hollows covered with a green coating, 
consisting of silicate of protoxide of 
iron, spreading over the carbonate of 
lime beneath. Texture similar to No, 36. 
41. CELLULAR BASALT. 
Map No. 
Same locality as last. 
Color ‘brownish-grey, contains small 
embedded ironstone nodules, similar to 
those which constitute the ironstone 
gravel of the plains (Bean-ore”). 
Wiis. 
TMB 
42. Brown, PISOLITIC CLAY. 
List No. 10. 
Korkuperrimul Creek. 
43. GREENISH-GREY CLAY. 
List No, 8. 
Korkuperrimul Creek. 
Decomposed basalt. 
44, Grey CLAY. 
Bruthen Creek, near Port Albert, 
Gippsland. 
45. Sort, MOTTLED CLAY. 
Bruthen Creek, near Port Albert, 
Gippsland. 
Contains traces of phosphoric acid. 
46. Brown OLAY. List No. 5. 
With oval, lighter brown pieces of 
some decomposed mineral. 
47, Rep Cray. List No. 16. 
Phillip Island, Western Port Bay. 
Similar to the last. 
48. VARIOUS CLAYS. 
Bruthen Creek, near Port Albert, 
Gippsland. 
Six specimens. 
(a) (Dark-red.) Forms a fine red 
pigment, and can be used as red 
chalk. 
(b) A soapy rock, dark pluish-black 
and red base, with green and 
brown spots, giving it a porphy- 
ritic appearance. 
(c) A greenish-colored clay, with red 
portions like a; the green color 
. is probably due to the silicate of 
the protoxide of iron. 
Small fissures and cavities occur in 
these clays, filled with pieces of a 
mineral substance, which on analysis 
was found to be composed chiefly of 
phosphate of lime, phosphate of alu- 
mina and quartz, and to be more or less 
coated and impregnated with ores of 
copper (red oxide, silicate, carbonate 
and phosphate). The pieces have not, 
however, yet been found to occur in 
sufficient quantity to be of any econo- 
mic yalue. 
49. BASALTIC CLAYS, 
Korkuperrimul. 
A chocolate-red base, with white 
streaks and spots; very aluminous and 
similar to 34. 
