In northern Arizona is a large Meteor Crater, the Barringer Crater, Its well preserved shape suggests a very recent origin.

An Asteroid labled 2012-tc-4 will supposedly miss the earth by 4000 miles on October 12,13 of 2017 . If that asteroid hit earth the damage would depend on several factors: speed of entry, does it hit on land or sea, angle of penetration at impact, size and weight of material, type of material in the rock, and whether the material is solid or loosely held together.

Consider an asteroid YU55 which came near the earth in 2011.

The age of this event has varied from 800 years ago to 200,000 years ago.

It all depends on what age determination method is used and what assumptions are made using the method.

It is estimated that first degree burns from the fireball would have afflicted people within 60 miles.

Could these asteroids have caused the earth to crack and continents to move?

The Hopi Indians who live in that area have legends about the meteor's impact.

Since they would have been living in the area at the time to have observed and passed on a tradition of the event for posterity, that would limit the impact to less than 10,000 years ago.

For an exhaustive treatment of the subject see Meteor Crater An Asteroid that hits earth can cause earth shattering catastrophic damage.