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Aztec Ruins National Monument

John M. Corbett

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Book Excerpt: 
. . .Geologists believe that after the last of the four great continental glaciations (i.e. the Wisconsin) there were three broad climatic periods over most of the western United States. These are called the Anathermal, which was cool and moist, becoming gradually warmer; the Altithermal, which was exceptionally dry; and the Medithermal, a relatively cool, moist period which is still in progress. Our imaginary tale about the hunters, if it had taken place, would have occurred during the Anathermal period.

These variations in climate have been determined by studying old stream terraces (streams cut deeper when there is more water, and they can carry a greater load of abrasive sands and gravels); old beach levels around ancient lakes (such as are prominent today around the Great Salt Lake in Utah); and ancient annual lake deposits of fine silts which form thin bands, or varves. Studies of animal life, both vertebrate and invertebrate, and plant life are important, for so. . . Read More

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