CONTENTS. 



No. 1.— Geological Expedition to Brazil and Chile, 1908-1939. By 

 J. B. WooDWORTH. (37 plates). November, 1912 1 



No. 2. — The Squantum Tillite. By Robert W. Sayles. (12 plates). 

 January, 1914 139 



No. 3. — Expedition to the Baltic Provinces of Russia and Scandinavia, 

 1914. 



Part 1. — The Correlation of the Ordovician Strata of the Baltic Basin 

 with those of Eastern North America. By Percy E. Raymoxd. 

 (8 plates). July, 1916 177 



No. 4. — Expedition to the Baltic Provinces of Russia and Scandinavia, 

 1914. 

 Part 2. — The Silurian and High Ordovician Strata of Esthonia, Russia, 



and their Faunas 287 



Part 3. — An Interpretation of the Silurian Section of Gotland. By 



W. H. TwEXHOFEL. (5 plates). July, 1916 341 



