﻿Vol. 64.] CAMBEIAN AGE IN SOUTH AUSTRALIA. 259 



EXPLANATION OF PLATES XIX-XXVI. 



Plate XIX. 



Polished and ice-scratched boulder from the Cambrian till of Petersburg (South 

 Australia). Found and photographed by Mr. E. F. Pittman, Government 

 Geologist of New South Wales. 



Plate XX. 



View in the gorge of the Eiver Sturt, which has been cut in the Cambrian till. 



Plate XXL 



Yiew of the Cambrian till, in the Sturt-River gorge, illustrating the general 

 characteristics of the glacial beds. 



Plate XXII. 

 Another yiew of the glacial beds in the same river-valley. 



Plate XXIII. 



Another view of the same, showing a big subangular boulder of quartzite 

 with transverse fractures. 



Plate XXIV. 



View of characteristic Cambrian till, in Waterfall Creek, 

 Baroota (Flinders Eanges). 



Plate XXV. 



Another view of the till in Waterfall Creek, including a big angular 

 erratic of quartzite (fractured). 



Plate XXVI. 



Section in Blackwood Railway-cutting, near Adelaide, showing the base of 

 the Cambrian till with the underlying laminated quartzites (Mitcham 

 Series), and the inversion of the beds. 



[For the Discussion, see p. 260.] 



