Cobban, W. A., Kennedy, William James, University of Oxford (UNITED KINGDOM), Cobban, William Aubrey, (USGS-D), U.S. Department of the Interior (UNITED STATES), Landman, Neil H., (AMNH (I)), American Museum of Natural History (UNITED STATES). 2016. A survey of the Cretaceous ammonite Placenticeras Meek, 1876, in the United States Western Interior, with notes on the earliest species from Texas. 66 (4): 587-608.
Place:
Jackson County, Colorado, United States, North America