VOLCANIC ROCKS.—CASE V 25 
“The crater of Mount Franklin, for some distance down the outside 
and inside slopes, consists of a mixture of earthy scoriaceous basalt and 
real pumice-like scoriæ ; the former containing pieces of transparent 
t Oligoclase,’ and irregular lumps, frequently above several pounds in 
weight, of ‘Olivine,’ which latter, through partial decomposition, has 
however lost its green color, presenting either a uniform brownish-red 
or brown, speckled with green, appearance. The bottom of the crater, 
lying about 250 feet below the highest point of the rim, has an area of 
several acres, and shows two very gentle rises of unequal size, divided 
by a narrow depression. As the whole of this area lies lower than the 
bottom of the rent in the rim of the crater, it is probable that its own, 
and the drainage down the inside walls of the latter, having no direct 
outflow, soaks off through the porous basalt of the mantle, 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 scori-conglomerate, which dip at an angle of 17° 
towards the centre of the Mount. It remains doubtful, whether the 
ravine actually owes its origin to a side outbreak of basaltic lava—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 characterized by 
a very rugged surface and rocky escarpments, resembling the recent 
lava flows from the craters in the Western Districts.”—(Note 8, } sheet 
15 S.E.) 
22. BASALT. Map No. Re 29. 
P.I. Claim, Durham Lead. } 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 
crystalline texture. 
26. BASALT. Map No. R 65. 
Hill north of Lot 20, Newham. 
3 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. Basar (Dolerite). 
Map No. R 91. 
Magnet Hill, Baynton’s Station. 
ł sheet 51 S.W. 
Color light-grey ; exhibits a confused 
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 XII., No. 39. 
28. Basair (Anamesite), 
Map No. Re 10. 
Cargerie Creek, Leigh River. sheet 
64 N.E. r 
Color brownish-grey ; fine-grained, 
granular, slightly vesicular; vesicles 
coated and filled with carbonate of lime 
and sparry iron (spherosiderite). 
