FOSSIL VERTEBRATES 
COLLECTIONS 
The collections in this department are mainly from three sources, 
namely, Expeditions, Exchange, Purchase. 
First, and most important, are the collections brought in year by Collections 
year by expeditions sent out by the Museum to explore various fossil- Expeditions, 
bearing horizons in the United States and other parts of the world. 
Fifty-two expeditions have been sent out in this department between 
the years 1891 and 1909 inclusive, at a total cost of upward of $1 10,000. 
The expense of these expeditions is borne partly by the General 
Endowment Fund provided by the Trustees, partly by the special 
annual fund of $2,000 provided by Professor Henry Fairfield Osborn, 
and in some instances by funds for special explorations which have 
been provided by the late President Jesup, by Mrs. Jesup, by the 
late William C. Whitney, by Messrs. Percy R. Pyne, J. P. Morgan, Jr., 
Frank K. Sturgis, Henry Fairfield Osborn, and George J. Gould. More 
than half of the collections, both in number and value, have been 
obtained through Museum expeditions. 
Field Explorations. — Beginning in 1891, the various geological 
horizons and countries have been explored in the following seasons: 
Permian, Texas, 1902, 1906, 1908. 
Triassic, North Carolina, 1894, 1895. 
Upper Jurassic, Wyoming, 1897-1905; Montana, 1903. 
Marine Cretaceous, Kansas, 1897; S. Dakota, 1903. 
"Laramie" Cretaceous, Wyoming, 1892, 1900; Montana, 1902-9. 
Judith River Cretaceous, Montana. 
Paleocene (Puerco and Torrejon), New Mexico, 1892, 1896. 
Lower Eocene (Wasatch), Wyoming, 1891,1896; New Mexico, 1896. 
Lower Eocene (Wind River), Wyoming, 1891, 1896, 1905, 1909. 
Eocene (Huerfano), Colorado, 1897. 
Middle Eocene (Bridger), Wyoming, 1893, 1903-6, 1909. 
Middle Eocene (Washakie), Wyoming, 1893, 1895, 1908. 
Upper Eocene (Uinta), Utah, 1894, 1895; Wyoming, 1909. 
Oligocene (Fayum), Egypt, 1907-9. 
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