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Stories by Allan Cox

The Growth of Western North America

Over the past 200 million years the continent has been extended westward by repeated collisions with smaller land masses, some of which appear to have come from thousands of kilometers away...

November 1, 1982 — David L. Jones, Allan Cox, Peter Coney and Myrl Beck

Reversals of the Earth's Magnetic Field

Some volcanic rocks are magnetized in a direction opposite to that of the present magnetic field of the earth. The reason is that the earth's field has reversed nine times in the past 3.6 million years...

February 1, 1967 — Allan Cox, Richard R. Doell and G. Brent Dalrymple
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