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A science detective story: Hell Creek evidence pinpoints month of dinosaur extinction

This story is not really an agriculture or climate story, but it’s a very interesting look at how paleontologists determined the month in which a meteor crashed into the earth. This event led to the extinction of most dinosaurs 66 million years ago. The scientists did it by looking at fossils found in rocks created at that time period and using them to identify the growth stage of flowers and leaves. That provided clues about what time of year the meteor fell, since the sunlight was blocked out by all of the debris that the meteor created when it hit the earth and caused a major freeze that killed the plants. You can read more at EarthSky at

Chicxulub impact asteroid. Source: Yahoo