CONTENTS OF PART I. 



PAGE 



PART I.— Geology i 



Introduction • Hi 



Structure iii 



Nomenclature xii 



Table A xvii 



Table B xviii 



Methods of Study xx 



Table C xxiii 



CHAPTER I.— The Geology of Eighteen Mile Creek 1 



General Description 1 



Age of the Gorge 3 



Detailed Description of the Sections 4 



Section 1. (H) 4 



The Black Naples Shales 5 



The Gray Naples Shales 7 



The Black Genesee Shales 9 



The Gray Genesee Shales 9 



The Styliolina Limestone 11 



The Conodont Bed 13 



The Moscow Shale 16 



Section 2. (G) 19 



Section 3. (F) 22 



Section 4. (E) 23 



Section 5. (D) 27 



The Encrinal Limestone 30 



The Lower Shales or Hamilton Shales Proper 33 



Section 6. (C) 34 



Section 7. (B) 37 



Section 8. (A) 40 



General Remarks 42 



The Mouth of the Stream 42 



CHAPTER II.— The Geology of the Lake Shore Sections 44 



The South Shore Cliffs 46 



The North Shore Cliffs 56 



Idlewood Cliff 56 



Wanakah Cliff. 57 



Erie Cliff. 60 



The Transition Beds 63 



Athol Springs Cliff. 65 



The Upper Marcellus Shales 65 



Bay View Cliff. 66 



General Summary of the Lake Shore Sections 67 



CHAPTER III.— Sequence of Geological Events 69 



Post Devonian Events 87 



