VOLCANIC ROCKS.—CASE V 
“The crater of Mount Franklin, 
and inside slopes, consists of a mixtu 
real pumice-like scoriæ ; the forme 
‘ Oligoclase,’ and irregular lumps, frequently above s 
weight, of ‘Olivine,’ which latter, through partial 
however lost its green color, presenting either a uni 
or brown, speckled with green, appearance. 
lying about 250 feet below the highest point 
several acres, and shows two very gentle rises of ur 
As the whole of this area 
bottom of the rent in the rim of the crater, 
and the drainage down the inside walls of the latter, 
outflow, soaks off through the porous basalt of the mant] 
by a narrow depression. 
25 
for some distance down the outside 
re of earthy Scoriaceous basalt and 
r containing 
Pieces of transparent 
everal pounds in 
decomposition, has 
form brownish-red 
The bottom of the crater, 
of the rim, has an area of 
nequal size, divided 
nis lies lower than the 
1t is probable that its own, 
having no direct 
e, and contributes 
largely to the numerous springs around the foot of the Mount.”—(Part 
of Note 1, } sheet 15 S.E.) 
“Towards the north end of the crater, 
a narrow and very pre- 
cipitous rent in its side exposes thick, variously colored beds of volcanic 
ash, cinders and scorix-conglomerate, which dip at an angle of 17° 
towards the centre of the Mount. 
ravine actually owes its origin to a side outbreak 
It remains doubtful, whether the 
of basaltic laya—the 
source, perhaps, of the basaltic stream in the flat below—or whether it has 
simply been caused by strong flows of water from the top of the Mount.” 
“ The termination of the Jim Crow Creek flow is char 
acterized by 
a very rugged surface and rocky escarpments, resembling the recent 
lava flows from the craters in the Western Districts.” —(Note 8, 4 sheet 
15 S.E.) 
22. BASALT. Map No. Re 29. 
P.I. Claim, Durham Lead. 3 sheet 
63 S.E. 
Color light-grey, close-grained, dense 
and compact: containing crystals of 
olivine and titaniferous iron. 
23. BASALT. 
Flat-topped hill near Mortlake. 
Color bluish-grey; fine-grained and 
minutely vesicular: contains olivine. 
24. BASALT. Map No. Ra 46. 
Parish of Coliban, S.E. of Glen- 
lyon. 4 sheet 10 N.W. 
Color light-grey; fine-grained and 
compact: small crystals of olivine 
abundant throughout. 
25. BASALT. Map No. R 57. 
Lot 30, Newham, near the Jim- 
Jim. 3 sheet 5 S.W. 
Color light-grey ; compact and close- 
grained, porphyritic, with embedded 
grains of a yellowish-white mineral 
(triclinic felspar) and small crystals 
of augite(?): affects the magnetic 
needle and exhibits a high degree of 
polarity 
26. BASALT. Map No. R 65. 
Hill north of Lot 20, Newham. 
4 Sheet 5 S.W. 
Color light bluish-grey; compact, 
fine-grained and magnetic: porphyritic 
by imbedded crystals of triclinic felspar 
and decomposed grains of olivine. 
27. Basaur (Dolerite). 
Map No. R 91. 
Magnet Hill, Baynton’s Station. 
+ sheet 51 S.W. 
Color light-grey ; exhibits a confused 
crystalline texture. Small crystals of 
magnetic pyrites, mostly converted into 
brown iron-ore, abound throughout the 
mass, causing it to strongly affect the 
magnetic needle, with a high degree of 
polarity. A specimen of this basalt, 
cut into a long bar, will be found in the 
mineral collection.—Case XUI., No. 39. 
28. Basaur (Anamesite). 
Map No. Re 10, 
Cargerie Creck, Leigh River. + sheet 
64 NE 
_ Color brownish-grey ; fine-grained, 
granular, slightly vesicular ; © vesicles 
coated and filled with carbonate of lime 
and sparry iron (spherosiderite), 
