SOS GENERAL GEOLOGY OF MARULAN AND TALLOXG, X.S.W. 



L. L. Waterbouse, B.E., R. S. Bonney, B.A., LLB., W. "R. 

 Browne, A. B. Walkom, G. J. Buriows, and AY. T. Anderson. 

 I wish also to thank Messrs. H. and A. Rumse}' for much local 

 scientific information, and for personal guidance on several 

 occasions. 



EXPLANATION OF PLATES LXV.-LXIX. 



Plate Ixv. 



Geological Map of Tallong and Marulan, from the Great Southern Eaihvay 

 Line, on the north, to the Shoalhaven River and Buugonia Creek 

 on the south. 



Plate Ixvi. 



Geological Section, From A to B, on the above Map. Note that the 

 isolation of the Silurian rocks by the grano-diorite is only apparent. 

 Had the line of section been a little further south, this isolation 

 would not have appeared. 



Plate Ixvii. 



Fig. L — Razorback, looking south. Hills in the foreground consist of 

 Upper Ordovician slates with abundant graptolites. In the dis- 

 tance is the precipitous gorge of the Shoalhaven River, near 

 Tolwong Mine. 



Fig. 2. — Glenrock grano-diorite, Marulan Creek, showing the jointing of 

 the rock, and the way in which stream-development has been 

 influenced by the presence of an aplitic vein. 



Plate Ixviii. 



Fig. 1. — Highly contorted Ordovician(?) slates just below Badgery's Cross- 

 ing, Shoalhaven River. 

 Fig. 2. — Lower limestone-belt (Silurian), Hogg's Lime-kilns, Marulan. 



Plate Ixix. 



Fig. I. — Microphotograph of Glenrock Grano-diorite( x 23 diameters). 



Fig. 2. — Microphotograph of Granite-Porphyry, Portion 113, Parish Marulart 



( X 23 diameters). 

 Fig.3. — Dacite, southern boundary Portion 113, Parish Marulan(x2tJ 



diameters). 

 Fig. 4. — No.2 of contact series. Microphotograph( x 23 diameters) 

 Fig.5. — No.4 of contact-series. Microphotograph( x 23 diameters). 

 Fig. 6. — No. 6 of contact-series. Microphotograph( x 23 diameters). 



