1. Neogene geomorphic evolution of the central San Juan Mountains near Creede, Colorado Yale Public content 1995. 2002-06-01T04:00:00Z. 2020-06-25T19:51:04Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. Public. San Juan Mountains Region (Colo. and N.M.). Neogene.