The area is roughly an oblong, bounded on three sides by 
main roads, and with the Adelaide to Melbourne railway passing 
through the reserve in a winding course. The western third of 
the area consists of low ridges up to two hundred feet high, 
converging towards the level area which contains the main sports 
ovals, tennis courts, etc. There is fairly good evidence that one 
of the main north-south faults of the Mount Lofty Ranges 
separates this western third from the eastern two-thirds, running 
north and south approximately, through the site of the old 
Government House. The eastern two-thirds of the park consist 
of much steeper hills, rising up to 1,600 feet above sea level. In 
places, such as the Long Gully sports ground, the valley floor is 
wide and level, providing a second series of sites for cricket, 
tennis courts, etc. 
Otherwise the interfluves are long and narrow, and the 
valleys steep-walled. The physiography of the northern half is 
dominated by the Workanda Creek, upon which there are two 
prettily-situated waterfalls, and along which there are many 
routes for interesting rambles. Into the Workanda Creek from 
the north come the tributaries Peeroomba and Kurroo Creeks, 
while the main southern tributary is the Tilti Creek. The 
southern portion, which is more frequented, has been formed by 
the action of the Minno Creek, with its northern tributary, the 
Tarnma Creek, and its southern tributary, the Karka Creek. 
Between these tributaries erosion has left a series of residual 
ridges roughly east-west These are for the most part covered 
by a eucalypt forest, with interesting variations in vegetation, 
according to aspect and soil differences. The student of physio- 
graphy may thus find in the National Park less spectacular 
effects than those at Morialta, but he will have the opportunity 
of studying a landscape of semi-mature erosion in the western 
portion, and of late youth in the eastern portion. Apart from 
this, there is a wide variety of topographic differences even in 
such a small tributary valley as the Tapurro Creek, which is 
little more than twenty-five chains long, rising from its small 
fan delta near the Blackwood Spring (t.ooo feet) to the quarry 
near the road on the Warriparri Ridge (1.300 feet). The area 
can be strongly commended to naturalists and students as one 
well worthy of systematic study. 
In conclusion, while South Australian naturalists are to 
be complimented on the variety of topographic, geological, 
botanical, and zoological material available in their public parks, 
the need for small reserves of mallee, mangrove, and sand-dune 
is worthy of emphasis. The possibility also" of securing a coastal 
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