CONTENTS 5 



The Eurypterid Faunas and their Associated Organisms — continued PAGE 



Siluric 84 



Lower Siluric (E ei) Fauna of Bohemia 84 



Upper Lower Siluric (E 62) of Bohemia 85 



Wenlock fauna of Pentland Hills, Scotland 85 



Shawangunk Fauna of Eastern North America 86 



Pittsford Fauna of New York 86 



Bertie Fauna 87 



Kokomo Fauna 87 



Upper Siluric Fauna of Oesel 87 



Temeside Fauna of England 88 



Ludlow Fauna of Scotland 88 



Lanarkian Fauna of Scotland 90 



Devonic 90 



Old Red Sandstone Fauna of Scotland 90 



Chapter IV. The Lithogenesis of the Eurypterid-bearing Beds 93 



1 . The Belt Terrane 93 



2. The Normanskill and Schenectady Beds 96 



Summary 100 



3. The Shawangunk Conglomerate 100 



4. The Pittsford Shale 102 



5. The Bertie Waterlime 106 



Theories of Origin 108 



a. Chemical Origin 108 



b. c. Organic Origin 109 



d. Clastic origin 109 



Summary 117 



6. The Kokomo Waterlime 118 



7. The Tarannon-Wenlock Beds of Southern Scotland 120 



Distribution of Formations 120 



The Llandovery-Tarannon 123 



Wenlock of the Pentland Hills 131 



8. The Upper Siluric of Oesel 140 



History of Discoveries 141 



General Stratigraphy 143 



9. Upper Siluric of Podolia and Galicia 149 



10. The Ludlow of England and the Ludlow and Lanarkian of Scotland. . . 151 



Introduction 151 



The Upper Siluric of England 153 



The Ludlow and Lanarkian of Lanarkshire 159 



1. The Lesmahagow Inlier 160 



2. The Anticline of the Hagshaw Hills 165 



11. The Old Red Sandstone 167 



History and Subdivisions 167 



The Caledonian 172 



The Orcadian 176 



Theories of Deposition 177 



