Within the last fifteen years several expeditions have been sent out from Princeton for the purpose of exploring in the west. In 1876 the Nassau Scientific Association was organized and in the summer of the following year a party was sent out, the geologists, botanists, and mineralogists working in Colorado, and the paleontologists and topographers in Utah and Wyoming. A more successful expedition was made in 1878 by a small party which explored the Bridger Eocene of south western Wyoming. In 1882 another successful party made a collection of the White River Miocene of Dakota and Nebraska. The trip to the Wasatch beds of northern Wyoming under Professor Scott in 1884 accomplished little, but in 1885 and 1886, valuable collections were made from the Bridger country and from the little-known vita fountains of northeastern Utah. In 1889 the seventh expedition secured extensive collections from the miocene formations of eastern Oregon.
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