Phenocryst compositions of late ash-flow tuffs from the central San Juan caldera cluster
Subtitle: results from Creede drill-hole samples and implications for regional stratigraphy
By: by Peter W. Lipman, Patricia E. Weston.
Contributors: Weston, Patricia E.; Bethke, Philip Martin, 1930-; Geological Survey (U.S.); U.S. Continental Scientific Drilling Program.
Series: Preliminary scientific results of the Creede caldera Continental Scientific Drilling Program; Open-file report -- 94-260-B.; U.S. Geological Survey open-file report -- 94-260-B.
Publisher: U.S. Dept. of the Interior, U.S. Geological Survey
Published: 2001
Place of publication: [Denver, Colo.]
Language: eng
Format: Microform
Number of pages: 43
Subjects: Volcanic ash, tuff, etc. -- Colorado -- Creede Region.; Phenocrysts -- Colorado -- Creede Region.; Boring -- Colorado -- Creede Region.; Creede Formation (Colo.)
Notes: Cover title.

"P.M. Bethke, editor."

Shipping list no.: 2002-0363-M.

Includes bibliographical references (p. 12-13).

Microfiche. [Denver, Colo. : U.S. Geological Survey, 2002]. 1 microfiche : negative.