Vol. LVI., No. 7. 
71 
SOME GEOLOGICAL NOTES ON THE PIONEER 
RIVER BASIN AND ADJACENT AREAS. 
By Frederick Bennett, B.Sc. 
(With one map in the text.) 
(Received 24 th April , 1944; accepted for publication 31 st July , 1944; 
issued separately, 25 th June, 1945.) 
INTRODUCTION. 
This paper deals with the middle and lower portions of the Pioneer 
River basin below Nicholson’s Crossing (Parish Abingdon, por. 1302) 
and areas adjacent to this part of the basin — and broadly includes the 
parishes of Hamilton, Ossa, Hampden, Bassett, Abingdon, Greenmount 
■and Howard, all of which are subdivisions of the County of Carlisle. 
PHYSIOGRAPHY. 
The River basin is in thej lower part determined chiefly by (1) 
The Northern Divide running S.E. from Mt. Dalyrmple to Kungurri 
then S. of Mt. Martin through Mt. Toby to Mt. McGregor, then turning 
E. by Mt. de Moleyns to The Leap, through Farleigh and the Black 
Mountain thence to Glenalbyn, Glenella through portion 95, parish 
Bassett past the head of Thornber Creek to Slade Point where it reaches 
the sea — then, presumably, under the sea, to Brampton Island. 
(2) On the west a granitic scarp from Mt. Dalyrmple S.E. to 
Dun wold (where a lower part to the S. lets Cattle Creek through) then 
by the Mia Mia Ranges S. as far as the west of por. 133, parish Mia 
Mia (where it joins a spur from the Clarke Range south of Boongana). 
(3) An eastern boundary coming up from Connor’s Range on the 
S. through Mt. Bridgman, Mt. McBryde, Ben Mohr and Blue Mountain. 
A low exit point exists round Mirani; Mt. McGregor lies N.N.E., 
the Blue Mountain is S.E. and the Mia Mia Range lies S.W. 
The determining slopes are two — a slope S.E. towards the coast 
between Dundulu and McE wen’s Beach — the other, the steeper of the 
two, due E. towards Mt. Bassett. 
The river therefore runs due E. from Mirani falling 171 feet in 
25 miles and in consequence of this big fall there are few really big 
pools. The river is rapid, and, running near the base of the igneous 
north scarp for 25 miles, has a rocky bed as far as Dumbleton; it is 
only at Foulden that tidal influences come into play. 
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