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Shorter contributions to the stratigraphy and geochronology of Upper Cretaceous rocks in the western interior of the United States
Stratigraphy and geochronology of Upper Cretaceous rocks, in the western interior of the United States
Stratigraphy and geochronology of Upper Cretaceous rocks, western interior, U.S
iii, 10, 16, 6 pages : illustrations, maps ; 28 cm.
ch. A. Conglomerate facies and contact relationships of the Upper Cretaceous upper part of the Frontier Formation and lower part of the Beaverhead Group, Lima Peaks area, southwestern Montana and Southeastern Idaho / by T.S. Dyman, J.C. Haley, and W.J. Perry, Jr. -- ch. B. U-Pb ages of volcanogenic zircon from porcellanite beds in the Vaughn member of the mid-Cretaceous Blackleaf Formation, southwestern Montana / by R.E. Zartman ... [et al.] -- ch. C. Occurrences of the free-swimming Upper Cretaceous crinoids Uintacrinus and Marsupites in the western interior of the United States / by William A. Cobban.
"U.S. Department of the Interior, U.S. Geological Survey"--Title page verso.
Two illus. on 2 pages of plates in pocket.
Cover title. [P. [4] of cover.] : Stratigraphy and geochronology of Upper Cretaceous rocks, western interior, U.S.