1901 Miocene of Colorado
Financed by William C. Whitney to explored Tertiary Formations of eastern Colorado, Dr. Matthew, Dr. Loomis, from Amherst College and Mr. Thomson proceeded southward to Pawnee Buttes, Colorado, examining outcrops on their way. They found one rather rich, but limited pocket North of Crawford, Nebraska. At Pawnee Buttes they were joined by Barnum Brown, who had been working at Cedar Creek. The party spent a little over a month at Pawnee Buttes. There was no particularly rich quarry area. Fossils were scattered throughout the formation. A large number of 3-toed horses and about nine land tortoises were found.