173 



PAPERS READ. 



A CONTRIBUTION TO THE GEOLOGY AND PETRO- 

 GRAPHY OF BATHURST, NEW SOUTH WALES. 



By J. Milne Curran, F G.S. 

 (Plates xiv.-xviil) 



CONTENTS, 

 i. — Introduction. 

 ii. — Area dealt with. 

 hi. — Previous observers, 

 iv. — General Geology. 

 v. — Formations represented . 

 vi. — Minerals of Bathurst. 

 vil— Rocks of Bathurst. 



A. Igneous Rocks 



B. Sedimentary Rocks- 





C. Altered Rocks 



viii. — The Sedimentary Rocks, 

 ix.— The Igneous Rocks. 



Granite 



Basalt 



x. — Economic Geology 

 xi.— Other points of interest, 

 xil— Conclusion. 



Plutonic — Acidic. 



Volcanic — Basic. 



Arenaceous. 



Argillaceous. 



Calcareous. 



Hornfels. 



Schists. 



Knotenschiefer. 



a. In the field. 



b. Origin of. 



c. Microscopic examination. 



d. Chemical composition. 



a. In the field. 



b. Microscopic examination. 



c. Chemical composition. 



