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Yet, it is the canyon’s rock walls that allow people to develop their greatest perspective on geologic time, because of these rocks’ immense age, their fossil record, and because these rocks formed in environments far different than those found in northern Arizona today.With a rock record that spans more than 1500 m.y., Grand Canyon is truly a panoramic view into the geologic past.AA(Geological Institute, Russian Academy of Sciences, Moscow, Russia), AB(Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI, USA), AC(Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI, USA), AD(Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI, USA), AE(Department of Geological Sciences, University of Florida, Gainesville, FL, USA), AF(Geological Institute, Russian Academy of Sciences, Moscow, Russia) Paleomagnetic results on thick lava series are among the most important sources of information on the characteristics of ancient geomagnetic fields.Most paleo-secular variation data from lavas (PSVL) are of late Cenozoic age.Grand Canyon National Park [see Photo 1] is one of the best places in the world to gain a sense of geologic, or “deep,” time because the canyon exposes a great swath of geologic history.Rocks exposed in Grand Canyon are truly ancient, ranging from 1840 million years old (m.y.), or 1.84 billion years old (b.y.), to 270 m.y.Here is one example of an isochron, based on measurements of basaltic meteorites (in this case the resulting date is 4.4 billion years) [Basaltic1981, pg. Skeptics of old-earth geology make great hay of these examples.For example, creationist writer Henry Morris [Morris2000, pg.

Oriented samples were collected from 125 flows, resulting in 88 acceptable quality flow-means (n ⩾ 4 samples, radius of confidence circle α ⩽ 15°) of the high-temperature magnetization component.Nonetheless, how geologists determine the age of rocks is a mystery to many members of the public, and even to many park rangers [see Photo 2], guides, and others who share the canyon’s geologic story with others. ” when geologists say a Grand Canyon rock formed 270 million years ago.Further confusion arises when one publication or geologist says, for example, that the Kaibab Formation is 270 m.y. The same questions arise for the other rock units at Grand Canyon. This article will answer these questions by providing a short primer on geologic dating methods and how they were applied to Grand Canyon rocks.In a related article on geologic ages (Ages), we presented a chart with the various geologic eras and their ages.In a separate article (Radiometric dating), we sketched in some technical detail how these dates are calculated using radiometric dating techniques.The latest high-tech equipment permits reliable results to be obtained even with microscopic samples.