THE ROCKS OF NOYANG 



A. W. HOWITT, F.a.S. 



CONTENTS 



PAGE 



i. Introduction 19 



ii. Physical Geography and Geology of the District - - 20 



iii. The Igneous Bocks - - - ■ - - - - 21 



(a) Quartz-Mica-Diorites 21 



(b) Quartz-Mica-Porphyrites and Quartz-Granophyrites - 34 



(c) Quartz-Porphyrites 45 



(d) Quartz-Felsophyrites 48 



(e) Diorites 51 



(f) Diabase 53 



iv. The Sedimentaey and Metamokphic Eoces 54 



. Conclusion ---------- 66 



