144 Obituary—Dr. F.. V. Hayden. 
region and eastern slopes of the Rocky Mountains, whence he drew 
the conclusion that the elevation of the mountains went on slowly 
through the whole Tertiary, commencing with the Laramie, which 
afforded some brackish-water fossils. 
His first two expeditions were made in 1853 and 1855 to the Bad 
Lands on White River, in Dakota, that of 1858 at the expense of 
Professor James Hall. Large collections of remains of fossil 
mammals were brought home, besides numerous other species. His 
paleontological friend, Mr. F. B. Meek, was with him. In 1857 
he accompanied Lieut. G. K. Warren’s expedition, and made the 
discovery of the rich Niobrara Mammalian fauna, newer than the 
White River, and obtained a great number of specimens. In 1866 
he visited the ‘“‘ Bad Lands,” making collections for the Academy of 
Natural Sciences of Philadelphia. The mammalian remains obtained 
in these various expeditions, along with those gathered by Dr. John 
Evans in 1849 and 18538, and Mr. Culbertson 1850, were the 
materials used by Dr. Leidy for his great work on the Extinct 
Fauna of Dakota and Nebraska (1869). 
During 1859 and 1860, Dr. Hayden was connected, as geologist, 
with Capt. Raynold’s expedition to the headwaters of. the Yellow- 
stone and Missouri. In 1867, after the civil war, the series of 
government expeditions under his charge was begun that continued 
through the consecutive years to the close of 1878. By these 
expeditions his explorations became extended over large parts of 
Nebraska, Dakota, Colorado, Utah, Wyoming, Montana, New Mexico, 
and Kansas. The first appropriation was only 5000 dollars ; but the 
later were more liberal, and besides his regular corps, a number of 
other scientists sometimes accompanied the exploration. Mr. Meek 
accompanied him, and through him large numbers of invertebrate 
species of the Cretaceous, Tertiary, Jurassic, and other formations 
were figured and described; and precision was thus given to the 
facts for success in Jaying down the subdivisions of these formations 
and mapping their distribution. After the death of Mr. Meek in 
December, 1876, his department passed under the charge of Dr. C. A. 
White. Mr. L. Lesquereux investigated, figured and described the 
fossil plants of the Laramie and other formations. Dr. Cope joined the 
expeditions of 1872 and 1878 and afterwards described the vertebrate 
fossils, collected in these and later years, in two quarto volumes. 
The many volumes of the expedition, in 8vo. 4to. and the atlases, 
need not here be enumerated. Dr. Hayden had reason for feeling 
eratified with the great scientific results obtained by the expeditions 
under his charge, and the wonderful discoveries made concerning 
the ancient life of the continent, its vast mineral resources, and the 
successful mapping of its topographic features. 
Since the expedition closed in June, 1879, Dr. Hayden has resided 
in Philadelphia. 
Dr. Hayden was a member of the National Academy of Sciences, 
and received various honours from academies abroad. He was 
elected a Foreign Member of the Geological Society of London 
in 1879.—Silliman’s Amercian Journal. 
