Paleomagnetic and ⁴°Ar/³⁹Ar geochronologic data from Late Proterozoic mafic dikes and sills, Montana and Wyoming /

Bibliographic Details
Main Authors:	Harlan, Stephen S. (Author), Geissman, John William (Author), Snee, Lawrence W. (Author)
Format:	Government Document eBook
Language:	English
Published:	Washington : United States Government Printing Office, 1997.
Series:	U.S. Geological Survey professional paper ; 1580.
Subjects:	Geology, Stratigraphic > Proterozoic. Geochronometry > Montana. Geochronometry > Wyoming. Sills (Geology) > Montana. Dikes (Geology) > Wyoming. Dikes (Geology) Geochronometry. Geology, Stratigraphic. Proterozoic Geologic Period. Sills (Geology) Montana. Wyoming. From 570 million to 2 billion years ago
Online Access:	https://purl.fdlp.gov/GPO/LPS21271

Description
Item Description:	"Paleomagnetic and 40Ar/39Ar results from mafic dikes and sills in northwestern Wyoming and western Montana indicate that they were emplaced during a regional magmatic event at 780 to 770 Ma."
Physical Description:	1 online resource (16 pages) : illustrations, maps.
Bibliography:	Includes bibliographical references (pages 14-16).