Timeline of Meteorite Asteroid Impact Craters on Earth Asteroid, meteorite, and cometary impacts have occurred throughout Earth's history. Some of them seem to have been large enough to cause environmental changes and extinctions. This laminated, double-folded, 10 1/2" X 22" timeline features 6 panels of information, charting these important events. Over 160 craters have been verified, with all of them plotted to scale in size and placed upon a geologic timeline. Along with craters, geologic ages are shown, and known major extinctions are correlated. Attractive and easy-to-use study tool. Click to enlarge |
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