ii CONTENTS. 



(bb) The Lower Miocene or Prome Stage . 61 



(a) Lithological characters . . 61 



(b) Palaeontological characters . 62 



(c) The occurrence of petroleum . 63 

 3. Stratigraphy ....... 77 — 123 



A. General Features 77 



(a) Unequality of sedimentation . . 77 



(b) Veins of eruptive mud ... 80 



(c) The anticlinal and dome-like structure 86 



(aa) The anticlinal arch . . 86 



(bb) The longitudinal arch , . 87 



B. Superficial sections .... 89 



C. The sections of the drilled wells . . 91 



D. The original sedimentation of the petroli- 



ferous beds . . , . .' in 



E. General conclusions, and further prospects 



of the Yenangyoung Oil-field . . 115 



(a) The native reserves . . . 116 



(b) The area exploited by drilled wells . 123 



Chapter V.-THE OCCURRENCE OF PETROLEUM 



NEAR YENANGYAT 124—137 



1. Geographical Position, Area and Physical 



Geography . . . . . . 124 



2. Geological Features . . . . . 126 



A. The Pliocene or Irrawaddi Series . . 126 



B. The Miocene or Pegu Series . . . 126 



(aa) The Upper Miocene or Yenan- 

 gyoung Stage . . . . 126 

 (bb) The Lower Miocene or Prome Stage 128 

 (cc) The Occurrence of Petroleum . 129 

 3 Stratigraphical Features . 132 — 137 



A. The Superficial sections .... 132 



B. The sections of the drilled wells . . 133 



Chapter VI.— THE OCCURRENCE OF PETROLEUM AT 



OTHER LOCALITIES IN UPPER BURMA . 137 



Chapter VII.— RELATION BETWEEN THE OCCUR- 

 RENCE OF PETROLEUM AND THE 

 MAIN STRUCTURAL LINES OF UPPER 

 BURMA 138—142 



Chapter VIII.— CHEMICAL COMPOSITION AND PHY- 

 SICAL PROPERTIES .... 143—159 



Part II.— ECONOMIC IMPORTANCE OF THE OIL- 



FIELDS OF BURMA 160 



Chapter I.— THE YENANGYOUNG OIL-FIELD. . .160—202 



1. The Community of Twinzayos and their history 160 



2. The Construction of the Pit wells . . . 164 



