" ae yh oe - {oe a 
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 NorRTH AMERICA. 
By Percy E. Raymonp. 
TABLE OF CONTENTS. 
’ _ Pace. 
Preface : 179 
The Ordovician seetas in lie Gdveausents of Petroavad snd Bathinda 
Russia . i ‘ ; : ‘ « eh Sh 
The Lower and Middle Gadovieis of Saunier , { , , . 206 
Correlation of the American with European formations . : «eee 
Correlation of the Trenton in America J . . é eee 
General discussion of Russian early Ordovician isan . é ie 
Detailed sections in Russia . , : , . : : : Cee 
Bibliography ‘ : : : ; ; , : : : .  ~2e0 
Explanation of Plates 
PREFACE. 
THE writer has been engaged since the summer of 1900, in the study 
of the stratigraphy and faunas of the Middle Ordovician formations 
of the northeastern United States and Canada. During all that time 
the need of a personal knowledge of the Ordovician strata of northern 
Europe had become more pressing, so that he was exceedingly glad of 
a grant from the Shaler Memorial fund which enabled him to spend 
several months of the summer of 1914 in Russia and Scandinavia. 
With the codperation of Dr. W. H. Twenhofel, who studied especially 
-the Upper Ordovician and Silurian strata, a rather complete, though 
necessarily hasty survey of the Lower Palaeozoic strata of the districts 
mentioned was completed between May 1 and September 30 of 1914, 
and large collections secured. The outbreak of the war interfered 
with the completion of the work as planned, and quite seriously 
affects the present report, since all the collections of three men during 
a month spent in Esthonia were in Russia at the time of the outbreak 
of hostilities and it is somewhat doubtful if they ever reach this 
country. Our conclusions on some points are therefore of a tentative 
nature, and if we should be so fortunate as to receive the collections, 
a supplementary report may be necessary. 
