What evidence is there that a impact event 65million years ago during crusteacous period caused the extinction

Question

of the dinosaurs.

Answer 1

See for yourself.

Answer 2

All around the world, there is a thin iridium rich band at the sedimentary layer that is 65 million years old.  Iridium is a very dense element and for that reason, it is rare in the crust.  Numerous iridium rich meteors have been confirmed.  Lastly, a giant impact crater off the Yucatan penisula, 65 million years old has been identified.

Answer 3

There is a very thin layer of rock which contains elements such as Iridium.  Iridium is not found much on Earth, which means it must have been from a foreign source (say, a meteor!).

The dating of which this layer was created is nearly the same as where the last dinosaur fossils were located.  Pretty much one or two layers above the meteor rock layer, there are no more fossils.

Answer 4

Just educated guess, Their is really very little proof

Answer 5

There is much evidence to support the idea of an asteroid hitting the Earth to cause dinosaur extinction.  The first piece of evidence can be found in a huge crater 65 million years old (around the time of dinosaur extinction).  The crater has no signs of there being any past volcanic activity.  This allows scientists to surmise that an asteroid, probably 6 miles wide, collided with Earth to blast out a crater.  More evidence is found in a thin layer of 65 million year old claystone with an extremely high concentration of iridium – an element common in asteroids but rare on earth.  This leads scientists to believe that the asteroid that hit earth vaporized immediately after hitting earth; the iridium dust from the asteroid fell to the earth.  A layer of charcoal 65 million years old have been found in many sites around the world.  Scientists think that this charcoal was caused by hot debris let off from massive wildfires started from the impact of the asteroid hitting the Earth.  Another piece of evidence can be seen in a sudden decrease of carbon 13 in rocks 65 million years old.  Scientists attribute this to the impact of debris, dust, and smoke, caused by the impact of the asteroid, blocking the sun’s energy, affecting plant growth.  One last piece of evidence to support the theory is found in examining fossil pollen in rocks.  Fossilized pollen show big differences in plants before and after the believed asteroid impact.  Scientists use this to conclude that the effects of the impact destroyed existing plants; only hardy ferns and fungi reproduced after the collision.