CONTENTS, 



Letter of transmittal 17 



Abstract op volume 19 



Chapter I. — Introduction 23 



Outline of the area and subjects discussed 23 



Outline of previous publications ■ ;.. 2-i. 



Bibliography 28 



Outline of time relations or glacial succession 49 



Outline of drift sheets and intervals 50 



Outline of rock formations 52 



Trenton limestone and TJtica shale 53 



Hudson River group 54 



Medina group ". 54 



Clinton group 54 



Niagara group _ 54 



Salina and Waterlime, or the Onondaga series 55 



Lower Helderberg limestone 56 



Oriskany sandstone 56 



Comiferous limestone _ 56 



Marcellus shale and Hamilton formation 57 



Genesee, Portage, and Chemung, or Ohio shale series 58 



Waverly or Bedford shale 61 



Berea grit and shale (Catskill?) 62 



Cuyahoga shale (part of Pocono sandstone of Pennsylvania) 62 



Logan conglomerate (part of Pocono sandstone of Pennsylvania) 63 



Pottsville, or Conglomerate Coal Measures 64 



• Allegheny, or Lower Productive Coal Measures 64 



Conemaugh, or Lower Barren Coal Measures 65 



Monongahela, or Upper Productive Coal Measures 65 



Dunkard beds (Permian?) 65 



Chapter II. — Physical features _ 66 



Altitude - 66 



Topography _ _ 67 



Low plain south of Lake Ontario 68 



' Niagara escarpment _ _ 70 



Plain south of Niagara escarpment 71 



Comiferous escarpment 73 



Plain south of Comiferous escarpment -- 73 



Grand River Basin _ 74 . 



Scioto River Basin 75 



Maumee River Basin 76 



Upland plain of western Ohio and eastern Indiana 77 



Knobstone escarpment and shale basin of southern Indiana 77 



HiUy country 77 



5 



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