In the early twentieth century, with the development of Western scientific imperialism, Asia, South America, and Africa became sites for Western scientific exploration. Many paleontological specimens, including dinosaur bones, were discovered in China by foreign scientists and explorers and exported to museums in France, Sweden, and the United States. After the establishment of the Nationalist Government in Nanjing in 1927, anti-imperialist Chinese intellectuals attempted to prevent foreigners from exporting specimens unearthed on Chinese territory. In the summer of 1928, the fossils (...) discovered in the Gobi Desert by the Central Asiatic Expedition of the American Museum of Natural History were detained in China. A series of negotiations ensued between Chinese and American diplomats and scientists over the issues of the ownership of fossils and the format of international scientific collaborations. By studying the interests and stakes for players in the different social worlds involved in the dispute, this essay explores the relations among science, diplomacy, and the politics of deep time. (shrink)