Berkey, Charles Peter, b. 1867.; Granger, Walter, 1872-1941.; Morris, Frederick Kuhne, 1886-; Central Asiatic Expeditions (1921-1930)
(New York City : The American Museum of Natural History, 1923)
"It appears from this listing of the formational units distinguished by locality and structural features that there are at least four formations of locality significance of late Mesozoic age, presumably Upper and Lower ...