DAA -« 
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DED De W. R. BROWNE. 
pourings may have been in the nature of fissure-eruptions, 
and the absence of tufis renders this highly probable. 
Lakes.—Mr. Sussmilch* ascribes the numerous small 
lakes which indent the surface of the country to warping 
of the earth’s crust as a result of the movements of eleva- 
tion. They seem to be most naturally associated with the 
formation of the present main divide, as they occur mostly 
in a belt about 4 miles wide lying along and to the north 
of the divide. In the case of Arable Lake it seems possible 
that its formation was due to ponding of the headwaters 
of Arable Creek by the upraising of the divide. 
EXPLANATION OF PLATES. 
Plate I1.—Geological Map of the Cooma District, N.S. Wales. 
Plate III.—Fig. 1. Phyllites in Slack’s Creek due west of 
‘‘ Kiaora,” showing dip towards the east 
and jointing in a direction E. 10° N. 
Fig. 2. Dykes of pegmatite intersecting amphibolite, 
in Cooma town. 
Plate IV.—Fig. 3. Outcrop of intensely crushed quartz-porphyry 
at Bunyan. Note the cleavage that has 
been developed. 
ig. 4. Wallaby Rocks, on the Murrumbidgee, about 
14 miles up the river from Mittagang 
Bridge. Note the youthful character of 
the gorge. The banks are composed of 
schist mainly. 
= 
Q 
Plate V.—Fig. 5. The northern portion of the S-bend, Murrum- 
bidgee River, looking a little west of south 
down the U-shaped dry valley in the 
Berridale fault-block. 
Fig. 6. Another view of the S-bend, looking east, and 
showing the river emerging from the fault- 
block. Observe the fault-scarp in the 
background. 
» Loc. cit. sup. 
