112 PROCEEDINGS OF THE ROYAL SOCIETY OP QUEENSLAND. 



recorded in the aera are, however, more nearly east-west. 

 Thus on the authority of Cameron (Q.G.S. Pubs. 151 and 219) 

 the general strike in the region of Cave Creek, the Little Robert- 

 son, Western Creek, Georgetown, and McDonneltown, is east- 

 west. At Mount Madden, Palmer Goldfield, east- west strikes, 

 and in the Maytown to Limestone Creek belt north-west 

 strikes, predominate (Jack, Q.G.S. Pub. 46). In the Cooktown 

 tin area north-west strikes are also common. Li the Ir^nne- 

 bank district the general strike is north-east (Skertchley, 

 Q.G.S. Pub. 119), and in the Duffs Creek and Tate districts 

 east- west (same author). 



In the Ravenswood district the general strike is north- 

 north-east (McLaren) ; and in the Cape River district west- 

 north-west (Rands). The general strike in the Kangaroo Hills 

 mineral field is east-north-east and east-west ; and in the Clon- 

 curry district east-west, west-south-west, east-south-east (Jack, 

 and Rands, Q.G.S. Pub. 10, 104, 136, 153, &c.). 



The west-north-west strikes are particularly noticed in 

 schists and gneisses of great geological antiquity. This is the 

 general strike direction also in the Precambrian formations of 

 the Northern Territory, and the tectonic trend of the great 

 granite intrusions which metamorphosed the schists of Northern 

 Australia. 



In greyvvackes and slates of Ordovician, Siluro -Devonian, 

 and Devonian age the strike directions are more variable, wbdle 

 the Carboniferous and Permo -Carboniferous beds have been 

 typically moulded on the Cambrian massif, and consequently 

 strike in directions parallel with the outline of the massif. 



The massif itself comprises, in addition to the bulk of 

 Western Australia and the whole of the Territory north of the 

 McDonnell Ranges, the Cloncurry-Burketown area, the Croydon 

 Georgetown area, and the Cape York Peninsula west of a line 

 running approximately from Fossilbrook to Princess Charlotte 

 Bay. It is largely covered by Cretaceo -Tertiary deposits. 



Prom Cooktown south along the coast to Kangaroo Hills, 

 thence in a general west-south-west direction, through the 

 Woolgar field to the Selwyn Range and probably on to the 

 McDonnell Ranges, we have a festoon of Siluro-Devonian (?) 

 rocks hidden here and there by the Cretaceous and Tertiary 

 transgressions. 



