478 
ROLAND DUER IRVING. 
first complete sections of the cretaceous and tertiary forma¬ 
tions of the West, and the names he applied to them have 
long been known and widely used. He was the first to 
demonstrate the fact that the Rocky mountains and adja¬ 
cent regions were covered during tertiary times with fresh¬ 
water lakes, and he also recognized as long ago as 1862 the 
fact that the elevation of the Rocky mountains began in 
Laramie times, and continued throughout the tertiary 
period, and is still going on at the present time. 
The gentleness and diffidence, approaching even timidity, 
which impressed his fellow students at Oberlin characterized 
Dr. Hayden throughout his life, and rendered it somewhat 
difficult for those who did not know him intimately to un¬ 
derstand the reasons for his success, which was undoubtedly 
due to his energy and perseverance, qualities which were 
equally characteristic of him as a boy and student and in 
later life. His desire to forward the cause of science was 
sincere and enthusiastic, and he was always ready to modify 
his views upon the presentation of evidence. He was in¬ 
tensely nervous, frequently impulsive, but ever generous, 
and his honesty and integrity undoubted. The greater 
part of his work for the Government and for science was a 
labor of love. 
A. C. Peale. 
ROLAND DUER IRVING. 
Roland Duer Irving was born in New York city April 
29, 1847, and died at Madison, Wis., May 30, 1888. 
His father was Rev. Pierre P. Irving, nephew of Washing¬ 
ton Irving, and a clergyman of the Episcopal church. His 
mother was a daughter of Judge Duer, an eminent lawyer, 
and at one time chief justice of the supreme court of the city 
of New York. 
In 1849 Dr. Irving removed his residence to New Brighton, 
Staten Island, where he was rector of Christ church. 
