It has been suggested that dinosaur DNA (the substance found in all cells) might have survived in the remains of blood-sucking insects preserved in fossilized tree resin, or amber. The film Jurassic Park was based on this appealing idea. However, we have to be content with the dinosaur descendents that still exist, such as birds, because only tiny and incomplete traces of DNA have been found in this way.
Was the Earth struck from space?
There is plenty of evidence that the Earth was struck by huge comets and possibly by great stony asteroids. These objects would have devastated huge areas of the land and changed the Earth’s climate for many years. At the time of the dinosaurs’ extinction there is evidence to suggest that an asteroid or comet struck the Yucatan Peninsula in the Gulf of Mexico. It produced tidal waves and global dust clouds that shut out the Sun’s light. Large amounts of the rare element iridium have been found in rocks deposited at this time. Iridium is believed to be characteristic of comets and meteorites.
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