K-Ar age of lava dam in Grand Canyon

Geological Society of America Bulletin
By: , and 



The K-Ar age of the basal basalt flow at the bottom of the "Lower Canyon group" of lavas near Toroweap fault is 1.16 ± 0.18 standard deviation (sd) m.y. This represents a minimum age of Grand Canyon, for at the time the lava formed, the canyon was essentially as deep as it is today. Since that time the Colorado River has cut through the 550-ft lava dam at the mouth of Toroweap Valley, an additional 50 ft of Paleozoic strata below, and through one or more younger lava dams in the area; downstream it has cut through 100 feet of younger intracanyon lavas.

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Publication type Article
Publication Subtype Journal Article
Title K-Ar age of lava dam in Grand Canyon
Series title Geological Society of America Bulletin
DOI 10.1130/0016-7606(1968)79[133:KAOLDI]2.0.CO;2
Volume 79
Issue 1
Year Published 1968
Language English
Publisher Geological Society of America
Description 4 p.
First page 133
Last page 136
Country United States
State Arizona
Other Geospatial Grand Canyon
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