U-Pb ages of volcanogenic zircon from porcellanite beds in the Vaughn member of the mid-Cretaceous Blackleaf Formation, southwestern Montana
By: by R. E. Zartman ... [et al.].
Contributors: Zartman, Robert E.
Series: Shorter contributions to the stratigraphy and geochronology of upper Cretaceous rocks in the western interior of the United States; U.S. Geological Survey bulletin -- 2113-B
Publisher: U.S. G.P.O.
Published: 1995
Place of publication: Washington
Language: eng
Number of pages: 16
Subjects: Geology, Stratigraphic -- Cretaceous.; Geology -- Montana -- Blackleaf Formation.; Zircon -- Montana -- Blackleaf Formation.; Uranium-lead dating.; Blackleaf Formation (Mont.)
Notes: Includes bibliographical references (p. 14-15).