Rocky Mountain Geology Vol. 44, No. 1

Spring 2009

Concurrent growth of uplifts with dissimilar orientations in the southern Green River Basin, Wyoming: Implications for Paleocene–Eocene patterns of foreland shortening
Philip L. Johnson; David W. Andersen 

⁴⁰Ar/³⁹Ar dates for the Spanish Peaks intrusions in south-central Colorado 
Brian S. Penn; David A. Lindsey

Framework for stratigraphic analysis of Pliocene fossiliferous deposits at Hagerman Fossil Beds National Monument, Idaho 
Dennis R. Ruez, Jr.

Quaternary incision rates and drainage evolution of the Uncompahgre and Gunnison Rivers, western Colorado, as calibrated by the Lava Creek B ash 
Andrew L. Darling; Karl E. Karlstrom; Andres Aslan; Rex Cole; Charles Betton; Elmira Wan