Geology and Natural History. 215 
erican 
n; and, moreover, remains of terrestrial plants exist in the 
Upper Silurian of Britain and Europe, but none had been found 
in North America. Professor Hall, in the third volume of his 
Paleontology (1859), presents reasons for transferring the Oriskany 
Pp from the Devonian to the r Silurian. He says, of 
tions 
6.) D 
first edition of the Geology, it is stated that recent observations 
fi 
published. Moreover, while the new edition of the Geology was 
i i rom Professor James Hall, of 
mM prepara f 
Albany, and from J. Peter Lesley, of Philadelphia (who was with 
Stron 
these reasons, additional information gna 
making the Catskill beds Chemung. eC 
Pennsylvania has a thickness, according to Rogers, of 6,000 feet. 
Reference to the facts observed by Jewett and Way were inadver- 
Leni ene Me Thi in the new 
fe ! an.—This age in 
Say fe eee asian for this, and 
ions of statements introduced, are so fully given 
ere 
