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Petroleum Geology of the State of Washington: Usgs Professional Paper 1582

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Petroleum Geology of the State of Washington: Usgs Professional Paper 1582

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    Available in PDF Format | Petroleum Geology of the State of Washington: Usgs Professional Paper 1582.pdf | English
    Lloyd G. Reynolds, Stanley H. Masters, Colletta H. Moser
Paleomagnetic and 40Ar/39Ar results from mafic dikes and sills in northwestern Wyoming and western Montana yield similar virtual geomagnetic poles and isotopic dates. In combination with paleomagnetic and geochronologic data from elsewhere in the western Cordillera, these data provide evidence for a regional mafic magnetic event at 780 to 770 Ma that affected a large area of western North America. show more
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